205117

Appears in sequences

• Number of (n+1)X4 0..1 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards.at n=4A204611
• Number of (n+1) X 6 0..1 arrays with the determinants of 2 X 2 subblocks nondecreasing rightwards and downwards.at n=2A204613
• T(n,k) = Number of (n+1) X (k+1) 0..1 arrays with the determinants of 2 X 2 subblocks nondecreasing rightwards and downwards.at n=23A204616
• T(n,k) = Number of (n+1) X (k+1) 0..1 arrays with the determinants of 2 X 2 subblocks nondecreasing rightwards and downwards.at n=25A204616
• Number of (n+1) X 8 0..1 matrices with each 2 X 2 subblock idempotent.at n=17A224549
• Number of compositions (ordered partitions) of n into pentagonal pyramidal numbers (A002411).at n=51A322853