A231284 Number of nX7 0..3 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero

0, 522, 105962, 31513702, 8501873308, 2336016267460, 640923626812310, 175842069555560942, 48247633863197248500, 13237975198745405063076, 3632190801170643496264878, 996587949883754866605651734

Offset

1,2

Comments

Column 7 of A231285

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

R. H. Hardin, Empirical recurrence of order 55

Formula

Empirical recurrence of order 55 (see link above)

Example

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

Crossrefs

Sequence in context: A128809 A279926 A230249 * A145497 A142778 A332675

Adjacent sequences: A231281 A231282 A231283 * A231285 A231286 A231287

Keyword

nonn

Author

R. H. Hardin, Nov 06 2013

Status

approved