75977

Appears in sequences

• Number of (n+2)X(n+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 and no antidiagonal sum 3 and no row sum 1 and no column sum 1.at n=21A257439
• Number of defective (binary) heaps on n elements from the set {0,1} where exactly n ancestor-successor pairs do not have the correct order.at n=21A372641