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What is the law if one wrote the Sefira?
Some Poskim rule that writing is unlike verbalizing, and one hence cannot fulfill his obligation through writing the Sefira. Accordingly, one who wrote the Sefira, must still count that night with a blessing. Other Poskim however rule that writing the Sefirah is valid. Practically, one is to recount without a blessing. If one counted in writing and did not recount properly, he may nevertheless continue counting with a blessing on the future nights.
 See Kaf Hachaim 489/27-28 and 84; Piskeiy Teshuvos 489/11; See Admur 47/3 regarding Birchas Hatorah
 Birkeiy Yosef 489/14; Rav Akiva Eiger 29-32; Chasam Sofer 6/19; Kesav Sofer Y.D. 106; Shaareiy Teshuvah 489/6; Aruch Hashulchan 489/9
 The reason: This is similar to one who writes a Mezuzah or Tefillin who cannot fulfill the Mitzvah of reading Shema with writing it alone. [ibid]
 Magen Shaul 20; Shvus Yaakov 1/30; Kol Eliyahu 1/30; Agurah Beahalecha p. 11; Opinion in Birkeiy Yosef 489/14 that it is possibly valid; 1st opinion in Admur 47/3 regarding Birchas Hatorah; See Kaf Hachaim 489/27-28 and 84
 The reason: This follows the same ruling as Birchas Hatorah, of which some Poskim rule one can be Yotzei with writing Torah. [ibid]
 Beis Oveid 14; Kaf Hachaim 489/28; See dispute in Admur 47/3 regarding Birchas Hatorah, and it seems Admur’s conclusion is to suspect for both opinions. Accordingly, the same would apply in this case as well
 See Admur 489/25 and Halacha 22; Zichron Yehuda 146; Yabia Omer 4/43 Piskeiy Teshuvos 489/21