A201802 Number of zero-sum nX7 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors

8135, 1972115, 90062519, 10857153407, 1077779765471

Offset

1,1

Comments

Column 7 of A201803

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A082919 A217222 A252144 * A233814 A190835 A013689

Adjacent sequences: A201799 A201800 A201801 * A201803 A201804 A201805

Keyword

nonn

Author

R. H. Hardin Dec 05 2011

Status

approved