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”).

A205619
Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock in a row having an equal number of equal diagonal or equal antidiagonal elements, adjacent rows differing in this number, and new values 0..2 introduced in row major order
0
14, 306, 13068, 1103436, 188139156, 63787803360, 44843430265344, 60947906705204832
OFFSET
1,1
COMMENTS
Diagonal of A205626
EXAMPLE
Some solutions for n=4
..0..0..0..0..1....0..0..0..1..1....0..1..1..2..2....0..1..1..2..1
..2..2..2..2..1....1..0..2..0..1....2..2..0..0..0....1..1..2..2..2
..0..2..0..2..2....2..0..2..0..1....1..2..2..0..1....2..0..0..1..0
..0..1..0..1..0....1..2..1..2..0....0..0..1..0..1....0..0..1..1..1
..2..0..0..0..2....0..0..0..2..0....2..0..0..2..0....1..2..2..2..2
CROSSREFS
Sequence in context: A276699 A258491 A251220 * A034912 A372350 A250966
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 29 2012
STATUS
approved