login
A303086
Number of 4Xn 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
1
8, 3, 112, 90, 1455, 3667, 33152, 157838, 1161232, 7100035, 49678916, 329669849, 2281641594, 15540614996, 107301648292, 737154651791, 5087197252026, 35051028229325, 241871543186476, 1668193998276026, 11511498465288360
OFFSET
1,1
COMMENTS
Row 4 of A303084.
FORMULA
Empirical recurrence of order 67 (see link above)
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..1..0..1..1. .0..1..0..0..1. .0..1..1..1..1
..1..1..1..1..1. .1..1..1..1..0. .0..1..0..0..1. .1..1..1..1..1
..1..1..1..1..0. .0..1..0..1..1. .0..1..0..0..0. .0..1..0..1..0
..0..1..0..1..1. .1..1..1..1..0. .0..1..0..0..1. .1..1..1..1..1
CROSSREFS
Cf. A303084.
Sequence in context: A303244 A038281 A302370 * A131502 A302891 A303626
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 18 2018
STATUS
approved