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”).

A298140
Number of n X n 0..1 arrays with every element equal to 2, 3, 6 or 7 king-move adjacent elements, with upper left element zero.
0
0, 1, 0, 8, 34, 92, 180, 1404, 4288, 29092, 125384, 859423, 4746446, 33970899, 232212614
OFFSET
1,4
COMMENTS
Diagonal of A298146.
EXAMPLE
Some solutions for n=7
..0..0..0..0..0..0..0. .0..0..1..1..1..1..1. .0..0..1..1..1..1..1
..0..1..1..1..1..1..0. .0..1..0..0..0..0..1. .0..1..0..0..0..0..1
..1..0..0..0..0..0..1. .0..1..1..1..1..1..0. .0..1..1..1..1..1..0
..1..1..1..1..1..1..1. .1..0..0..0..0..0..1. .1..0..0..0..0..0..1
..0..0..0..0..0..0..0. .0..1..1..1..1..1..0. .0..1..1..1..1..1..0
..0..1..1..0..1..1..0. .1..0..0..0..0..0..1. .0..0..1..0..0..0..1
..1..1..0..0..0..1..1. .1..1..1..1..1..1..1. .0..1..1..1..0..1..1
CROSSREFS
Cf. A298146.
Sequence in context: A212744 A298174 A249743 * A301887 A208639 A240785
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 13 2018
STATUS
approved