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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A222924

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

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: A264793 A228840 A117667 * A036080 A215368 A200795

Adjacent sequences:  A222917 A222918 A222919 * A222921 A222922 A222923

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 09 2013

STATUS

approved

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Last modified January 22 21:47 EST 2022. Contains 350504 sequences. (Running on oeis4.)