A201845 Number of zero-sum nX6 -1..1 arrays with every element equal to at least one horizontal or vertical neighbor

9, 1897, 259811, 47249907, 8964073263, 1759241274383, 350714115254871

Offset

1,1

Comments

Column 6 of A201847

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for n=2
..1.-1.-1.-1..1..0....1.-1.-1..0..0.-1...-1.-1..0..1..1..0...-1..0..1..1.-1..0
..1.-1.-1..1..1..0....1.-1..1..1..1.-1....1..1..0.-1.-1..0...-1..0..1..1.-1..0

Crossrefs

Sequence in context: A218415 A194135 A114224 * A218692 A024125 A232684

Adjacent sequences: A201842 A201843 A201844 * A201846 A201847 A201848

Keyword

nonn

Author

R. H. Hardin Dec 06 2011

Status

approved