81736

Appears in sequences

• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 101-111-101 pattern in any orientation.at n=20A146433
• Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= three.at n=10A287253
• Numbers k such that 447*2^k+1 is prime.at n=42A323193