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A318210
Number of nX4 0..1 arrays with every element unequal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1
2, 10, 21, 69, 245, 698, 2321, 7528, 24531, 80826, 263430, 865328, 2842893, 9337446, 30698901, 100854560, 331565806, 1089746855, 3582297494, 11775723803, 38708636705, 127247937304, 418290582504, 1375050737435, 4520146432969
OFFSET
1,1
COMMENTS
Column 4 of A318214.
LINKS
EXAMPLE
Some solutions for n=5
..0..1..0..1. .0..0..0..1. .0..1..0..1. .0..1..0..1. .0..1..1..0
..1..1..1..0. .1..0..0..1. .1..1..1..1. .1..1..1..1. .1..1..0..1
..1..1..1..1. .0..0..0..1. .0..1..0..0. .1..0..1..0. .1..1..1..1
..0..0..1..0. .0..1..1..1. .1..1..0..1. .0..0..0..0. .0..1..1..0
..0..1..1..1. .1..0..1..0. .0..0..0..0. .0..1..0..1. .1..0..1..1
CROSSREFS
Cf. A318214.
Sequence in context: A231376 A304700 A318548 * A080881 A138298 A303294
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 21 2018
STATUS
approved