A230274 Number of n X 7 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

0, 386, 173042, 47524048, 12303458948, 3159756711522, 810027275568580, 207640367754692812, 53220250459310073448, 13640617269270340804640, 3496170706479851061894156, 896086022476439653341182672

Offset

1,2

Comments

Column 7 of A230275.

Links

R. H. Hardin, Table of n, a(n) for n = 1..26

Example

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

Crossrefs

Cf. A230275.

Sequence in context: A213115 A277988 A224496 * A230475 A375944 A116329

Adjacent sequences: A230271 A230272 A230273 * A230275 A230276 A230277

Keyword

nonn

Author

R. H. Hardin, Oct 14 2013

Status

approved