login
A268964
Number of n X n 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.
1
3, 60, 2016, 136080, 18852912, 5712070032, 3870355944960, 5963413766987592, 21098726553552173712, 172587783760354579099176, 3279749300107885644432555744, 145303202175464965696103410891992
OFFSET
1,1
COMMENTS
Diagonal of A268971.
LINKS
EXAMPLE
Some solutions for n=4
..0..1..0..1. .1..0..0..1. .1..2..0..0. .2..1..2..2. .0..1..0..0
..0..1..0..0. .1..0..2..1. .1..0..1..2. .2..1..2..1. .2..1..1..0
..2..1..0..0. .1..2..2..1. .1..0..1..2. .2..2..2..1. .0..0..1..0
..2..1..1..0. .2..2..2..2. .1..0..1..0. .1..1..2..1. .0..0..1..0
CROSSREFS
Cf. A268971.
Sequence in context: A219870 A326283 A259268 * A361536 A081854 A085990
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 16 2016
STATUS
approved