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A239360
Number of nX7 0..2 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 3
1
8, 22, 46, 96, 218, 409, 729, 1154, 1742, 2550, 3625, 5080, 6985, 9338, 12170, 15509, 19408, 23914, 29068, 34912, 41488, 48838, 57004, 66028, 75952, 86818, 98668, 111544, 125488, 140542, 156748, 174148, 192784, 212698, 233932, 256528, 280528
OFFSET
1,1
COMMENTS
Column 7 of A239361
LINKS
FORMULA
Empirical: a(n) = 7*n^3 - 54*n^2 - 37*n + 1252 for n>16
EXAMPLE
Some solutions for n=3
..2..2..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..2..2
..2..1..2..2..0..0..0....0..0..0..2..2..0..0....0..0..0..0..2..2..1
..0..2..2..1..2..0..0....0..0..0..2..1..2..2....0..0..0..0..2..1..2
CROSSREFS
Sequence in context: A145067 A112684 A189584 * A211532 A269429 A305181
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 17 2014
STATUS
approved