A202860 Number of n X n 0..4 arrays with row and column sums one greater than the previous row and column.

5, 20, 776, 491892, 5393851108, 1081958661341802

Offset

1,1

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for n=3
..0..1..3....0..4..2....1..3..2....0..0..2....1..4..0....4..0..3....1..4..2
..1..2..2....3..1..3....3..1..3....0..1..2....3..0..3....0..4..4....3..2..3
..3..2..1....3..2..3....2..3..3....2..2..0....1..2..4....3..4..2....3..2..4

Crossrefs

Column 4 of A202864.

Sequence in context: A032072 A002030 A213148 * A344709 A156148 A224867

Adjacent sequences: A202857 A202858 A202859 * A202861 A202862 A202863

Keyword

nonn,more

Author

R. H. Hardin, Dec 25 2011

Status

approved