212787

Appears in sequences

• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-0010 pattern in any orientation.at n=17A146630
• a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = 0, a(1) = -1, a(2) = 0, a(3) = 1.at n=24A295735
• Numbers k such that A334943(k) = 1.at n=37A335773