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A302157
Number of n X n 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
1
1, 3, 7, 29, 140, 635, 2853, 19993, 75825, 786161, 2915241, 49663915, 152854596, 4893607560, 13149908952, 764803558904, 1748158857032, 193883417013099, 378301363005384, 78801036106269590, 130887347815375440
OFFSET
1,2
COMMENTS
Diagonal of A302163.
LINKS
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..1..0..1..0. .0..1..0..0..1. .0..0..1..1..0
..0..1..0..1..1. .1..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
..0..1..0..1..0. .0..1..0..1..1. .1..1..0..1..0. .0..1..0..1..0
..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..1
..0..1..0..0..1. .0..1..0..1..0. .0..1..0..0..1. .0..1..0..1..0
CROSSREFS
Cf. A302163.
Sequence in context: A141477 A211371 A361436 * A294383 A082096 A119325
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 02 2018
STATUS
approved