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A301494
Number of nX4 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1
5, 3, 15, 83, 329, 1576, 7454, 35118, 164664, 775194, 3645639, 17147774, 80657947, 379401221, 1784617859, 8394449111, 39485697173, 185732299667, 873644951720, 4109438969157, 19329922572773, 90923822886180, 427686224315631
OFFSET
1,1
COMMENTS
Column 4 of A301498.
FORMULA
Empirical recurrence of order 77 (see link above)
EXAMPLE
Some solutions for n=5
..0..1..1..1. .0..0..0..1. .0..1..0..0. .0..0..0..0. .0..0..0..1
..1..1..0..0. .1..0..0..0. .1..0..0..0. .1..0..1..1. .1..0..0..1
..1..0..0..0. .1..0..1..1. .0..1..0..0. .1..0..0..0. .0..0..0..0
..1..0..0..1. .0..0..0..0. .1..0..0..1. .0..0..0..0. .0..0..0..0
..0..1..0..1. .0..0..1..1. .0..1..0..1. .0..0..1..0. .0..0..1..0
CROSSREFS
Cf. A301498.
Sequence in context: A223535 A211943 A189237 * A053371 A199005 A217415
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 22 2018
STATUS
approved