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A222920
Number of nX2 0..4 arrays with no three equal values in a row horizontally or vertically, and new values 0..4 introduced in row major order
1
2, 15, 174, 3183, 68076, 1543538, 35663142, 829049736, 19310392822, 450063924406, 10491666753024, 244592254688694, 5702297247404918, 132941283209423448, 3099351244544272614, 72257348464516101894, 1684586587434789765504
OFFSET
1,1
COMMENTS
Column 2 of A222924
LINKS
FORMULA
Empirical: a(n) = 28*a(n-1) -78*a(n-2) -789*a(n-3) +1250*a(n-4) +3796*a(n-5) -3288*a(n-6) -2208*a(n-7) +2432*a(n-8) -512*a(n-9) for n>11
EXAMPLE
Some solutions for n=3
..0..1....0..1....0..1....0..0....0..1....0..1....0..0....0..0....0..1....0..0
..0..0....1..0....0..2....1..0....2..2....2..0....1..2....1..2....2..3....1..1
..1..0....0..1....3..3....2..1....0..0....3..4....1..3....0..3....0..1....1..1
CROSSREFS
Sequence in context: A228840 A117667 A360483 * A036080 A215368 A200795
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 09 2013
STATUS
approved