39770

Appears in sequences

• Number of permutations in S_{2n} avoiding 123 and 1432 whose matrices are 180-degree symmetric.at n=13A166963
• Number of (n+1)X(n+1) -6..6 symmetric matrices with every 2X2 subblock having sum zero and three or four distinct values.at n=4A211258
• Numbers which are the sum of two squared primes in exactly three ways (ignoring order).at n=16A226562
• Number of (n+2)X(6+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and column plus the two sums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=21A259004