A202863 Number of n X n 0..7 arrays with row and column sums one greater than the previous row and column.

8, 56, 9128, 68544440, 24146966505628

Offset

1,1

Links

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

Example

Some solutions for n=3
..3..6..1....5..0..7....0..1..6....0..2..5....5..0..0....7..0..4....5..3..3
..5..2..4....1..6..6....1..5..2....2..5..1....0..5..1....3..5..4....1..5..6
..2..3..7....6..7..1....6..2..1....5..1..3....0..1..6....1..7..5....5..4..4

Crossrefs

Column 7 of A202864.

Sequence in context: A105850 A009089 A296466 * A244958 A043071 A304352

Adjacent sequences: A202860 A202861 A202862 * A202864 A202865 A202866

Keyword

nonn,more

Author

R. H. Hardin, Dec 25 2011

Status

approved