A202859 Number of n X n 0..3 arrays with row and column sums one greater than the previous row and column.

4, 12, 228, 41852, 80524892, 1720483641156

Offset

1,1

Links

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

Example

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

Crossrefs

Column 3 of A202864.

Sequence in context: A175718 A076030 A348789 * A131491 A286881 A366822

Adjacent sequences: A202856 A202857 A202858 * A202860 A202861 A202862

Keyword

nonn,more

Author

R. H. Hardin, Dec 25 2011

Status

approved