A231027 Number of nX4 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero

0, 62, 1074, 43566, 1444702, 50554618, 1740086452, 60169326764, 2078169462590, 71798088654394, 2480349543197958, 85688184666384078, 2960239863178974748, 102266505677802748874, 3532968690414317025252, 122052364457303115849762

Offset

1,2

Comments

Column 4 of A231031

Links

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

Example

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

Crossrefs

Sequence in context: A157499 A249235 A250564 * A103428 A248450 A115504

Adjacent sequences: A231024 A231025 A231026 * A231028 A231029 A231030

Keyword

nonn

Author

R. H. Hardin, Nov 03 2013

Status

approved