A204494 Number of (n+2)X3 0..2 arrays with every 3X3 subblock having three strictly increasing elements in a row horizontally or vertically

3971, 46458, 699151, 6047817, 65606908, 797822969, 8067170432, 86968465645, 981144743357, 10426325449799, 112695993317754, 1239189017004142, 13368905316841076, 144830300667655992, 1578871451817224540

Offset

1,1

Comments

Column 1 of A204501

Links

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

Formula

Empirical: a(n) = a(n-1) +26*a(n-2) +677*a(n-3) +1863*a(n-4) +3391*a(n-5) +2222*a(n-6) +485*a(n-7) -1392*a(n-8) -864*a(n-9) -324*a(n-10)

Example

Some solutions for n=3
..2..0..0....0..2..0....0..0..2....2..0..2....0..1..0....0..0..1....1..2..0
..1..0..2....0..0..0....1..2..1....2..0..2....0..0..2....2..0..1....2..0..2
..0..1..2....0..1..2....2..1..2....0..1..2....0..1..2....0..1..2....0..1..2
..0..1..0....0..1..1....0..1..2....0..2..1....2..2..1....0..1..2....0..2..1
..0..2..1....2..1..0....2..0..1....1..1..2....1..0..2....1..2..2....0..2..1

Crossrefs

Sequence in context: A031561 A031741 A204501 * A184492 A204493 A321053

Adjacent sequences: A204491 A204492 A204493 * A204495 A204496 A204497

Keyword

nonn

Author

R. H. Hardin Jan 15 2012

Status

approved