188773

Appears in sequences

• a(n) = sigma_4(n^2)/sigma_2(n^2).at n=21A084218
• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-00100-11111 pattern in any orientation.at n=22A147322
• Number of (w,x,y,z) with all terms in {1,...,n} and w*x < 2*y*z.at n=23A211795
• G.f. satisfies A(x) = 1 + x*A(x) / (1 + x*A(x))^2.at n=16A365085