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A195253
Number of lower triangles of a 7X7 0..n array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less
1
268435456, 22876792454961, 254948725307650, 786909681200387, 1479091549959182, 2226347741716207, 2987571816007840, 3751562406061261, 4515974674903982, 5280435818615649, 6044900876514412, 6809366105107111
OFFSET
1,1
COMMENTS
Row 7 of A195248
LINKS
FORMULA
Empirical: a(n) = 764465228592699*n - 2364216638005277 for n>10
EXAMPLE
Some solutions for n=5
..3..............2..............5..............0..............5
..4.5............3.4............4.3............2.0............3.3
..4.4.3..........5.4.5..........2.4.4..........0.2.0..........2.2.4
..2.3.2.4........5.5.4.4........3.3.2.4........2.2.2.0........1.2.3.2
..3.3.3.3.4......3.4.4.2.3......3.4.3.4.3......2.1.0.1.1......0.2.4.4.2
..3.3.1.2.4.4....2.4.3.2.2.1....3.4.5.3.2.2....0.1.2.1.1.2....0.2.3.3.4.4
..3.2.2.3.4.5.4..2.2.2.2.3.1.1..3.3.3.3.2.1.1..1.2.3.2.0.1.0..2.2.1.3.3.5.3
CROSSREFS
Sequence in context: A223698 A195237 A194936 * A122969 A137492 A105014
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 13 2011
STATUS
approved