login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A221418
Number of nX7 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two
1
0, 696, 0, 2026142, 0, 6079373768, 0, 18276976590202, 0, 54950038339359640, 0, 165205902731001266892, 0, 496685395180484146016942, 0, 1493264942493018550037435988, 0, 4489441162093631430608332402302, 0
OFFSET
1,2
COMMENTS
Column 7 of A221419
LINKS
EXAMPLE
Some solutions for n=4
..0..2..0..2..0..2..0....0..2..2..2..0..0..0....0..2..2..0..0..2..0
..0..2..2..2..2..2..0....0..0..2..2..2..2..2....0..0..2..2..2..2..2
..0..0..2..2..0..0..2....0..2..0..2..0..0..2....0..2..2..2..0..0..0
..0..2..0..0..2..0..2....0..0..2..0..2..2..0....0..0..0..0..2..2..2
CROSSREFS
Sequence in context: A214165 A048925 A251367 * A157435 A048426 A209731
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 15 2013
STATUS
approved