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A203021
Number of n X 3 nonnegative integer arrays with adjacent horizontal and vertical element pair sums equal to all values in 0..2nk-n-k-1 (each exactly once).
0
2, 36, 3216, 257664, 69822004
OFFSET
1,1
COMMENTS
Column 3 of A203022.
EXAMPLE
Some solutions for n=3
..0..1..7....0..2..8....7..1..4....4..6..0....1..7..0....0..1..4....9..0..1
..0..2..4....0..3..1....0..1..2....7..2..3....0..2..3....0..8..2....2..0..3
..4..3..6....1..5..6....0..9..2....0..0..1....0..4..7....4..3..0....5..5..3
CROSSREFS
Cf. A203022.
Sequence in context: A178949 A200571 A213985 * A319507 A001070 A095229
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 27 2011
STATUS
approved