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A297971 Number of n X n 0..1 arrays with every element equal to 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero. 0
0, 1, 8, 109, 18037, 5902043, 7833283900, 33544649054853, 475420963845148631 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
Diagonal of A297978.
LINKS
EXAMPLE
Some solutions for n=5
..0..0..0..1..1. .0..0..1..1..0. .0..0..1..0..0. .0..0..0..0..1
..0..0..0..0..1. .0..1..1..0..0. .0..1..1..0..0. .0..1..0..1..1
..1..1..1..1..0. .1..0..0..1..1. .0..0..1..1..1. .0..1..1..0..1
..0..1..0..1..0. .0..1..0..0..1. .1..1..0..1..1. .0..0..1..0..0
..0..0..0..0..0. .0..0..1..1..1. .1..0..0..0..1. .0..1..1..0..0
CROSSREFS
Cf. A297978.
Sequence in context: A309188 A371385 A098623 * A076151 A020560 A144813
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 10 2018
STATUS
approved

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Last modified May 26 16:43 EDT 2024. Contains 372840 sequences. (Running on oeis4.)