28364domain: NAppears in sequencesNumber of 3 x n binary matrices without unit columns up to row and column permutations.at n=41A057524G.f. A(x) satisfies: A(x) = 1 + Sum_{k>=1} k*x^k*A(x)^k/(1 - x^k*A(x)^k).at n=8A307399Numbers k such that the sums (with multiplicity) of prime factors of k and k+1 are both squares.at n=29A359445