45376domain: NAppears in sequencesSingular n X n matrices over GF(2).at n=3A060704Number of solutions of x^4=1 in general affine group AGL(n,2).at n=3A063387a(0)=1. a(n) = a(n-1)*(n+1), if n is in the sequence. a(n)= a(n-1) +1, if n is missing from the sequence.at n=25A118471