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”).

A265886
Number of n X n 0..2 arrays with the sum of the absolute differences of each element with its horizontal and vertical neighbors equal to the number of neighbors.
1
3, 12, 68, 664, 13672, 560512, 51483264, 8726974464, 3316077264896, 2260633288966144, 3463290521072435200, 9453965541320232534016, 58047351977461819763589120, 633980080610711649347287646208
OFFSET
1,1
COMMENTS
Diagonal of A265887.
LINKS
EXAMPLE
Some solutions for n=4
..2..1..2..2....0..0..1..0....1..2..1..0....1..2..1..2....2..1..0..1
..1..2..0..0....2..2..0..1....2..1..2..1....0..1..2..1....1..2..1..2
..2..2..0..1....1..2..0..2....1..2..1..0....1..2..1..0....2..1..2..1
..0..0..1..2....0..1..0..2....0..1..0..1....2..1..0..1....1..2..1..2
CROSSREFS
Cf. A265887.
Sequence in context: A058115 A101313 A257605 * A295762 A375811 A375807
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 17 2015
STATUS
approved