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

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

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: A228840 A117667 A360483 * A036080 A215368 A200795

Adjacent sequences: A222917 A222918 A222919 * A222921 A222922 A222923

Keyword

nonn

Author

R. H. Hardin Mar 09 2013

Status

approved