

A252772


Number of (n+2)X(2+2) 0..3 arrays with every consecutive three elements in every row, column and nwse diagonal having exactly two distinct values, and new values 0 upwards introduced in row major order


1



1028, 4717, 23114, 121043, 649951, 3523216, 19170149, 104987624, 576681145, 3171047173, 17490297027, 96593843143, 533791409154, 2954525292098, 16363224352613, 90662353009326, 502747340040879, 2788709900040761
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OFFSET

1,1


COMMENTS



LINKS



EXAMPLE

Some solutions for n=4
..0..1..1..0....0..0..1..0....0..1..0..1....0..0..1..0....0..1..1..2
..0..2..2..1....0..0..2..2....0..2..2..3....1..1..0..1....0..1..0..1
..2..1..2..1....2..3..2..2....1..1..2..1....1..0..0..1....3..0..0..1
..0..1..1..0....0..3..3..0....1..2..1..1....0..0..1..0....0..0..3..0
..0..2..2..0....2..0..2..0....2..1..1..2....0..1..0..0....0..3..0..0
..2..1..2..2....2..3..2..3....2..1..2..1....2..0..0..1....1..3..3..1


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



