A230992 Number of nX4 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, and upper left element zero

0, 16, 182, 10914, 465638, 20549430, 899786196, 39531660010, 1735714471900, 76213836360618, 3346443118527598, 146938989787609588, 6451913103215823902, 283296068073088420816, 12439202883241219243898, 546191007683593063562226

Offset

1,2

Comments

Column 4 of A230994

Links

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

Example

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

Crossrefs

Sequence in context: A204608 A279282 A231135 * A016298 A288720 A125428

Adjacent sequences: A230989 A230990 A230991 * A230993 A230994 A230995

Keyword

nonn

Author

R. H. Hardin, Nov 02 2013

Status

approved