143359

Appears in sequences

• Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11000-01110-00011 pattern in any orientation.at n=13A147188
• a(0) = 12, after which, if (2*a(n-1)) - 1 = product_{k >= 1} (p_k)^(c_k) then a(n) = product_{k >= 1} (p_{k-1})^(c_k), where p_k indicates the k-th prime, A000040(k).at n=45A246343
• G.f. A(x) satisfies: A(x - 3*x*A(x)) = x - 2*x*A(x).at n=6A291814