A230702 Number of (n+3)X(2+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero

8, 28, 244, 800, 6576, 21076, 173428, 554040, 4558536, 14555468, 119758148, 382358832, 3145930352, 10044068932, 82639468964, 263844008200, 2170826159272, 6930820136252, 57024624645332, 182063126310336, 1497958570841456

Offset

1,1

Comments

Column 2 of A230708

Links

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

Formula

Empirical: a(n) = 31*a(n-2) -126*a(n-4) +42*a(n-6) +79*a(n-8) -a(n-10) +8*a(n-12)

Example

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

Crossrefs

Sequence in context: A152014 A316512 A200034 * A374280 A244613 A228281

Adjacent sequences: A230699 A230700 A230701 * A230703 A230704 A230705

Keyword

nonn

Author

R. H. Hardin, Oct 28 2013

Status

approved