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A198978
Number of nX4 0..5 arrays with values 0..5 introduced in row major order and no element equal to any horizontal or vertical neighbor
2
5, 481, 146286, 53082012, 19622872903, 7267830860056, 2692353648978984, 997397244990907738, 369492074075459555844, 136880688981914387733120, 50708322978926251631508008, 18785221234054066344117511329
OFFSET
1,1
COMMENTS
Column 4 of A198982
LINKS
FORMULA
Empirical: a(n) = 454*a(n-1) -33435*a(n-2) +955655*a(n-3) -13146749*a(n-4) +95351613*a(n-5) -373512375*a(n-6) +780821577*a(n-7) -866661210*a(n-8) +478426797*a(n-9) -102202326*a(n-10)
EXAMPLE
Some solutions with all values from 0 to 5 for n=5
..0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1
..1..0..1..0....1..0..1..0....1..0..1..0....1..0..1..0....1..0..1..0
..2..3..0..1....2..3..0..1....2..3..0..1....2..3..0..1....2..1..0..3
..0..4..3..5....0..1..4..3....4..1..5..3....4..5..4..3....0..3..4..2
..1..5..2..1....4..5..3..1....5..3..4..0....3..4..5..0....5..2..3..0
CROSSREFS
Sequence in context: A262384 A024071 A321939 * A206502 A198249 A160363
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 01 2011
STATUS
approved