A230247 Number of nX4 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero

0, 26, 514, 18218, 517794, 15075834, 442507578, 12967930114, 379758106610, 11121513851802, 325716543442890, 9539276850178962, 279376258709766802, 8182075105297220362, 239627981406267902506, 7017971646531106112850

Offset

1,2

Comments

Column 4 of A230250

Links

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

R. H. Hardin, Empirical recurrence of order 63

Formula

Empirical recurrence of order 63 (see link above)

Example

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

Crossrefs

Sequence in context: A001723 A163201 A205990 * A058461 A323492 A265461

Adjacent sequences: A230244 A230245 A230246 * A230248 A230249 A230250

Keyword

nonn

Author

R. H. Hardin, Oct 13 2013

Status

approved