66133

Appears in sequences

• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-0100-0111 pattern in any orientation.at n=17A146875
• Triangle read by rows: T(n,k) is the coefficient A_k in the transformation Sum_{k=0..n} x^k = Sum_{k=0..n} A_k*(x+3*(-1)^k)^k.at n=23A249268