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A231949 Number of (n+1)X(n+1) 0..1 arrays with every element equal to some horizontal, vertical, diagonal or antidiagonal neighbor, with top left element zero 1
4, 142, 14842, 6517534, 11501370840, 80362090509378, 2227569337736429246, 245123750599446294788488, 107075160540284607946778623864, 185664549157140167132223088015356148 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A231957

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..12

EXAMPLE

Some solutions for n=3

..0..1..1..1....0..0..0..0....0..1..1..0....0..1..1..0....0..1..1..1

..0..0..0..1....1..0..0..1....0..0..0..1....1..0..0..1....1..0..0..0

..1..1..1..0....0..1..0..1....1..1..1..1....1..1..0..1....0..1..1..0

..1..1..0..1....1..1..0..0....1..1..0..0....1..0..1..0....0..0..0..1

CROSSREFS

Sequence in context: A247483 A293752 A299833 * A239248 A225133 A122422

Adjacent sequences: A231946 A231947 A231948 * A231950 A231951 A231952

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 15 2013

STATUS

approved

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Last modified November 27 10:41 EST 2022. Contains 358377 sequences. (Running on oeis4.)