

A230939


Number of whitesquare subarrays of (n+2)X(7+2) 0..3 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero


1



42, 1312, 8450, 208172, 1604098, 41991510, 318984080, 8279222070, 62983913970, 1636647076866, 12449868229094, 323476245049122, 2460739904000374, 63937066423053164, 486382045071603570, 12637596474609429472
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OFFSET

1,1


COMMENTS



LINKS



EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



