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A232030
Number of (n+1)X(n+1) 0..1 arrays with every element equal to some horizontal, vertical or antidiagonal neighbor, with top left element zero
1
3, 76, 6958, 2504637, 3495632937, 18901428867727, 396123615709336849, 32176890056971879660693, 10130525958339456502522410735, 12362161675037799092546476765921887
OFFSET
1,1
COMMENTS
Diagonal of A232038
LINKS
EXAMPLE
Some solutions for n=3
..0..1..1..1....0..0..0..1....0..0..1..0....0..0..0..0....0..0..0..0
..0..1..0..1....0..0..0..1....1..0..1..0....1..0..0..0....0..1..0..0
..1..0..0..0....0..0..1..1....1..1..1..1....1..0..0..0....0..1..0..1
..0..0..1..1....0..1..1..1....0..0..0..1....0..1..1..0....1..0..1..1
CROSSREFS
Sequence in context: A300386 A054747 A302375 * A054950 A335722 A183961
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 17 2013
STATUS
approved