A230802 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 at least one element with value (x(i,j)-1) mod 4, and upper left element zero

0, 16, 40, 1370, 10448, 183088, 2045378, 29175688, 365502344, 4913369536, 63632416648, 840894973402, 10994101352914, 144572017467922, 1895295043605416, 24887788287735872, 326523191949148616

Offset

1,2

Comments

Column 4 of A230805

Links

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

R. H. Hardin, Empirical recurrence of order 68

Formula

Empirical recurrence of order 68 (see link above)

Example

Some solutions for n=4
..0..1..0..3....0..1..3..2....0..1..2..3....0..1..1..2....0..3..0..1
..3..2..1..2....3..2..0..1....3..2..1..0....3..2..0..3....1..2..1..2
..3..0..1..2....2..1..0..3....3..0..2..1....1..0..2..1....0..3..0..3
..2..1..0..3....3..0..1..2....2..1..3..0....2..3..3..0....3..2..1..2

Crossrefs

Sequence in context: A300901 A174086 A174081 * A100958 A246344 A044093

Adjacent sequences: A230799 A230800 A230801 * A230803 A230804 A230805

Keyword

nonn

Author

R. H. Hardin, Oct 30 2013

Status

approved