A231030 Number of n X 7 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, 10162, 2049324, 1740086452, 1050541512334, 688099769580280, 441589771066454894, 284877908767181431748, 183540635813549508209004, 118290502618097762855637884, 76230841327679401437205021568

Offset

1,2

Comments

Column 7 of A231031.

Links

R. H. Hardin, Table of n, a(n) for n = 1..17

Example

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

Crossrefs

Cf. A231031.

Sequence in context: A023066 A248487 A172810 * A323486 A153139 A243974

Adjacent sequences: A231027 A231028 A231029 * A231031 A231032 A231033

Keyword

nonn

Author

R. H. Hardin, Nov 03 2013

Status

approved