505623

Appears in sequences

• Number of lower triangles of an n X n -1..1 array with all row and column sums zero.at n=6A195515
• T(n,k) = Number of lower triangles of an n X n -k..k array with all row and column sums zero.at n=27A195522
• Number of lower triangles of a 7X7 -n..n array with all row and column sums zero.at n=0A195525
• T(n,k) is the number of lower triangles of an n X n 0..k array with all row sums equal to the length of the row and all column sums equal to the length of the column.at n=34A195644