A201846 Number of zero-sum nX7 -1..1 arrays with every element equal to at least one horizontal or vertical neighbor

7, 8741, 2809217, 1459651671, 697824874477, 350714115254871

Offset

1,1

Comments

Column 7 of A201847

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Sequence in context: A247822 A247823 A234626 * A116631 A212937 A074489

Adjacent sequences: A201843 A201844 A201845 * A201847 A201848 A201849

Keyword

nonn

Author

R. H. Hardin Dec 06 2011

Status

approved