A203020 Number of nX2 nonnegative integer arrays with adjacent horizontal and vertical element pair sums equal to all values in 0..2nk-n-k-1 (each exactly once)

1, 8, 36, 544, 12700, 431432, 17482140, 1012606444

Offset

1,2

Comments

Column 2 of A203022

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=4
..2..1....2..4....4..1....5..0....5..1....1..7....5..2....3..3....2..7....0..2
..0..0....2..3....2..0....4..0....0..0....3..2....4..1....4..5....0..0....0..6
..5..4....0..0....7..0....2..1....7..2....0..0....0..0....0..0....1..4....4..3
..3..3....8..1....1..3....0..7....1..2....6..1....2..6....2..1....2..4....1..0

Crossrefs

Sequence in context: A058823 A244301 A268157 * A276175 A050536 A261846

Adjacent sequences: A203017 A203018 A203019 * A203021 A203022 A203023

Keyword

nonn

Author

R. H. Hardin Dec 27 2011

Status

approved