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A297882
Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero.
0
1, 7, 20, 36, 114, 253, 433, 734, 1037, 1882, 2897, 4474, 4556, 9490, 7864, 13478, 31282, 20470, 123291, 55794, 102050, 328168, 112445
OFFSET
1,2
COMMENTS
Diagonal of A297889.
EXAMPLE
Some solutions for n=7
..0..1..0..1..1..0..1. .0..1..0..0..0..1..1. .0..0..1..0..1..1..0
..0..0..1..1..1..1..1. .1..0..1..1..1..0..0. .1..1..1..0..0..0..1
..1..1..0..0..0..0..0. .1..0..0..0..0..0..1. .0..1..0..1..0..1..0
..0..1..1..1..1..1..1. .0..0..1..1..1..0..1. .0..1..0..1..0..1..0
..0..1..0..0..0..0..0. .1..1..0..0..0..0..1. .0..1..0..1..0..1..0
..1..0..1..1..1..1..1. .0..1..1..1..1..0..0. .1..1..1..0..0..0..1
..0..1..0..1..1..0..1. .0..1..0..0..0..1..1. .0..0..1..0..1..1..0
CROSSREFS
Cf. A297889.
Sequence in context: A269044 A063235 A063151 * A318790 A228882 A140676
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 07 2018
STATUS
approved