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A301656 Number of n X n 0..1 arrays with every element equal to 0, 1 or 4 horizontally or vertically adjacent elements, with upper left element zero. 0
1, 3, 6, 13, 46, 254, 2335, 37679, 1036686, 47847128, 3666918138, 462476814296, 95511722707577, 32204769674856063, 17694312704564808047, 15825068959028242214319 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A301662.
LINKS
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
..1..0..0..0..1. .1..0..1..1..1. .1..0..1..0..1. .0..1..0..1..0
..0..1..0..1..0. .0..1..0..1..0. .0..1..1..1..0. .1..0..1..0..1
..1..0..1..0..1. .1..0..1..0..1. .1..0..1..0..1. .0..1..0..1..0
..1..0..1..0..1. .1..0..1..0..1. .0..1..0..1..0. .1..0..1..0..1
CROSSREFS
Cf. A301662.
Sequence in context: A370208 A084816 A055738 * A359669 A322183 A295292
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 25 2018
STATUS
approved

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Last modified July 18 06:54 EDT 2024. Contains 374377 sequences. (Running on oeis4.)