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A300877
Number of nX4 0..1 arrays with every element equal to 0, 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1
8, 50, 148, 589, 2264, 8739, 34693, 138559, 556973, 2247619, 9087826, 36797650, 149145738, 604912470, 2454539244, 9962718432, 40445652520, 164218445897, 666820225171, 2707820511258, 10996313658874, 44656547438787
OFFSET
1,1
COMMENTS
Column 4 of A300881.
FORMULA
Empirical recurrence of order 97 (see link above)
EXAMPLE
Some solutions for n=5
..0..1..0..0. .0..0..1..1. .0..1..0..1. .0..1..1..0. .0..1..1..0
..0..0..1..1. .0..1..0..1. .1..1..1..0. .0..0..1..0. .1..0..0..1
..1..1..0..1. .1..0..1..0. .0..1..1..1. .1..1..0..1. .0..1..1..1
..0..0..1..0. .0..1..0..1. .0..1..0..0. .0..0..1..0. .1..0..1..1
..1..1..0..0. .0..1..1..0. .1..1..0..1. .1..1..0..0. .0..1..0..0
CROSSREFS
Cf. A300881.
Sequence in context: A258635 A300494 A300933 * A301487 A299686 A133426
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 14 2018
STATUS
approved