

A253483


Number of (2+1)X(n+1) 0..2 arrays with every 2X2 subblock nesw antidiagonal difference unequal to its neighbors horizontally and nw+se diagonal sum unequal to its neighbors vertically


1



558, 6804, 85464, 1069400, 13402934, 167888152, 2103506918, 26352981590, 330164967962, 4136436492474, 51823165353050, 649263096931468, 8134255022736090, 101909518812574074, 1276767300743745726
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OFFSET

1,1


COMMENTS



LINKS



FORMULA

Empirical recurrence of order 90 (see link above)


EXAMPLE

Some solutions for n=3
..0..1..0..0....1..2..1..2....2..0..0..2....0..2..1..0....1..1..1..0
..0..1..2..0....0..1..1..1....0..1..2..2....1..2..0..1....2..0..1..2
..0..0..1..0....2..0..1..0....2..2..0..2....2..2..1..0....2..1..0..0


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



