222925

Appears in sequences

• Triangle T(n,k) read by rows, giving the number of n X n binary matrices with no zero rows or columns and with k=0..n^2 ones.at n=42A055599
• Triangle T(r,n) read by rows: number of n X n (0,1)-matrices with exactly r entries equal to 1 and no zero row or columns.at n=32A104601
• Numbers k such that k and k^2 use only the digits 2, 4, 5, 6 and 9.at n=14A137096