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A318094 Number of nX4 0..1 arrays with every element unequal to 1, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1
2, 50, 220, 1563, 9193, 57744, 356786, 2215533, 13752047, 85343361, 529807380, 3288466317, 20413201710, 126710229626, 786538847475, 4882316701191, 30306289156276, 188121896133891, 1167739500871746, 7248574819342407 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A318098.
LINKS
FORMULA
Empirical recurrence of order 72 (see link above)
EXAMPLE
Some solutions for n=5
..0..1..0..0. .0..1..0..1. .0..1..0..0. .0..1..1..1. .0..1..1..0
..1..1..1..1. .1..0..0..1. .1..1..0..1. .1..0..0..0. .1..1..1..1
..0..1..1..0. .0..0..0..1. .1..1..0..1. .0..0..0..0. .1..0..0..0
..0..1..1..0. .1..1..0..0. .0..1..1..1. .0..1..0..1. .0..0..0..0
..0..1..1..0. .0..0..0..1. .0..1..1..0. .1..0..0..1. .1..1..1..1
CROSSREFS
Cf. A318098.
Sequence in context: A231082 A318426 A265962 * A226408 A226337 A048610
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 16 2018
STATUS
approved

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Last modified February 29 07:23 EST 2024. Contains 370414 sequences. (Running on oeis4.)