8372754

Appears in sequences

• Number of n X n symmetric matrices with (0,1) entries and all row sums 2.at n=10A000986
• Number of n X n symmetric binary matrices with all row sums 8.at n=2A139675
• Number of 10 X 10 arrays of squares of integers, symmetric about main diagonal, with all rows summing to n.at n=2A156402
• T(n,k)=Number of (n*k)Xk binary arrays with nonzero rows in decreasing order, no more than 2 ones in any row and exactly n ones in every column.at n=56A188448