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A302629
Number of n X n 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
1, 3, 8, 33, 257, 2262, 30216, 652931, 18446157, 797627174, 48788464441, 4420985966927, 579498900792438, 110425750437014304, 30435339544089493297
OFFSET
1,2
COMMENTS
Diagonal of A302635.
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..1..1..0..1. .0..1..0..1..0. .0..1..1..0..0
..0..1..0..1..0. .1..0..1..0..0. .0..1..0..1..1. .0..1..0..1..0
..1..1..0..1..0. .0..0..0..0..0. .1..1..0..1..0. .0..1..0..1..0
..0..1..0..1..0. .0..0..1..0..1. .0..1..0..0..0. .0..1..0..1..0
..0..1..0..1..0. .1..0..1..1..0. .0..1..0..1..0. .0..1..0..0..1
CROSSREFS
Cf. A302635.
Sequence in context: A109655 A184255 A001120 * A375249 A339315 A322303
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 10 2018
STATUS
approved