login
A296321
Number of n X n 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 neighboring 1's.
0
1, 3, 11, 61, 853, 20088, 850404, 72224019, 11207386103, 3245575984755, 1784744625714267, 1830394475306895557, 3517200566091635085954, 12698075318404649075573041, 85871949097296276009847589332
OFFSET
1,2
COMMENTS
Diagonal of A296327.
EXAMPLE
Some solutions for n=5
..0..0..0..1..1. .0..0..0..0..0. .0..1..1..0..0. .0..0..0..1..1
..0..0..1..0..1. .0..0..0..0..0. .1..0..1..0..0. .0..0..1..0..1
..0..0..1..0..1. .0..1..1..0..0. .1..1..0..1..1. .0..0..1..1..0
..0..1..0..0..1. .0..1..0..1..0. .0..0..0..1..0. .0..0..0..0..0
..0..1..1..1..0. .0..0..1..1..0. .0..0..0..0..0. .0..0..0..0..0
CROSSREFS
Cf. A296327.
Sequence in context: A004108 A203007 A343774 * A203768 A356268 A069725
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 10 2017
STATUS
approved