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A268121
Number of 5Xn arrays containing n copies of 0..5-1 with every element equal to or 1 greater than any north or west neighbors modulo 5 and the upper left element equal to 0.
0
1, 2, 5, 15, 111, 1687, 23522, 253472, 2290853, 18470974, 140294987, 1065068657, 8679331941, 80007298457, 822840131716, 8854238260868, 94125422868108, 961136731712639, 9379785431020093
OFFSET
1,2
COMMENTS
Row 5 of A268115.
EXAMPLE
Some solutions for n=6
..0..1..1..2..3..3....0..1..1..2..3..4....0..1..2..2..3..4....0..1..1..2..3..4
..0..1..2..2..3..4....0..1..2..3..4..0....1..1..2..3..4..0....0..1..2..2..3..4
..0..1..2..3..4..0....1..1..2..3..4..0....1..2..3..4..4..0....0..1..2..3..3..4
..1..2..3..4..4..0....1..2..3..3..4..0....2..3..4..0..0..1....0..1..2..3..4..0
..1..2..3..4..4..0....2..2..3..4..4..0....3..3..4..0..1..2....1..2..3..4..4..0
CROSSREFS
Cf. A268115.
Sequence in context: A191477 A196196 A266573 * A306794 A111790 A309115
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 26 2016
STATUS
approved