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

4, 142, 14842, 6517534, 11501370840, 80362090509378, 2227569337736429246, 245123750599446294788488, 107075160540284607946778623864, 185664549157140167132223088015356148

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