241221

Appears in sequences

• Sum of all terms on the two principal diagonals of a 2n+1 X 2n+1 square spiral.at n=35A114254
• Number of lower triangles of an n X n integer array with all row and column sums zero and all row and column sums of squares <=50.at n=4A195889
• T(n,k) = Number of lower triangles of an n X n integer array with all row and column sums zero and all row and column sums of squares <= 2k^2.at n=40A195892
• Number of lower triangles of a 5X5 integer array with all row and column sums zero and all row and column sums of squares <= 2n^2.at n=4A195893