A201844 Number of zero-sum nX5 -1..1 arrays with every element equal to at least one horizontal or vertical neighbor

1, 411, 17031, 1566319, 109797321, 8964073263, 697824874477, 56238345975057, 4510071758583443, 365508148420971423, 29684298137697156807, 2422133463372341456079, 198166150735435791683617

Offset

1,2

Comments

Column 5 of A201847

Links

R. H. Hardin, Table of n, a(n) for n = 1..16

Example

Some solutions for n=3
..1.-1..0..1.-1...-1..1..0..0..0...-1.-1.-1..1..0....0..1..1..1..0
..1.-1..0..1.-1...-1..1.-1.-1..1...-1..0..1..1..0....0.-1.-1.-1..0
..0..0..0..0..0....0..0.-1..1..1...-1..0..1..1..0....1..1.-1.-1..0

Crossrefs

Sequence in context: A187991 A090123 A055018 * A105211 A081378 A234190

Adjacent sequences: A201841 A201842 A201843 * A201845 A201846 A201847

Keyword

nonn

Author

R. H. Hardin Dec 06 2011

Status

approved