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A317740
Number of nX7 0..1 arrays with every element unequal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1
0, 22, 6, 35, 74, 36, 274, 280, 1065, 1939, 5947, 13101, 35847, 83062, 222994, 537669, 1395855, 3480819, 8943072, 22421261, 57460156, 144954058, 369414113, 936279738, 2382817938, 6046949393, 15383924113, 39073108671, 99355550907, 252459496924
OFFSET
1,2
COMMENTS
Column 7 of A317741.
FORMULA
Empirical recurrence of order 97 (see link above)
EXAMPLE
Some solutions for n=5
..0..1..0..1..0..1..1. .0..1..1..0..1..0..1. .0..1..0..0..1..1..1
..1..0..0..1..0..0..0. .1..0..0..1..0..0..1. .1..1..1..0..0..0..0
..0..0..1..1..0..1..1. .0..0..1..1..0..0..1. .0..1..1..0..0..1..1
..1..1..1..0..1..1..0. .1..1..1..1..0..0..1. .0..1..1..1..1..1..0
..0..1..0..0..1..0..1. .0..0..0..1..0..1..0. .1..0..0..1..0..0..1
CROSSREFS
Cf. A317741.
Sequence in context: A304456 A040469 A040468 * A317901 A040467 A194708
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 05 2018
STATUS
approved