A202862 Number of n X n 0..6 arrays with row and column sums one greater than the previous row and column.

7, 42, 4578, 17232446, 2303711043274

Offset

1,1

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for n=3
..0..5..4....2..0..2....1..1..5....5..2..5....3..3..6....1..3..2....4..5..3
..3..5..2....2..2..1....6..1..1....4..5..4....4..5..4....1..3..3....5..3..5
..6..0..5....0..3..3....0..6..3....3..6..5....5..5..4....4..1..3....3..5..6

Crossrefs

Column 6 of A202864.

Sequence in context: A205340 A304953 A293850 * A229437 A043064 A175159

Adjacent sequences: A202859 A202860 A202861 * A202863 A202864 A202865

Keyword

nonn,more

Author

R. H. Hardin, Dec 25 2011

Status

approved