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A201884
Number of zero-sum nX1 -2..2 arrays with every element equal to at least one horizontal or vertical neighbor
1
0, 1, 1, 5, 1, 23, 25, 97, 155, 553, 893, 2945, 5721, 16499, 34509, 96903, 211929, 571639, 1310827, 3446631, 8106415, 21036009, 50484447, 129556711, 315618625, 804915729, 1980809241, 5032086931, 12478845269, 31624865741, 78861551727
OFFSET
1,4
COMMENTS
Column 1 of A201888
LINKS
EXAMPLE
Some solutions for n=8
..2...-2....1...-2....0....0....1....1....2....1...-1....0....0...-2...-1....0
..2...-2....1...-2....0....0....1....1....2....1...-1....0....0...-2...-1....0
..0....0....0....2...-2....1....0...-1...-1...-1...-1...-1....0....2...-2....1
..0....0....0....2...-2....1....0...-1...-1...-1...-1...-1....0....2...-2....1
.-2....1...-2...-2....1...-2....0...-1....1....2....2...-1....1....0....1....1
.-2....1...-2...-2....1...-2....0...-1....1....2....2....1....1....0....1....1
..0....1....1....2....1....1...-1....1...-2...-2....0....1...-1....0....2...-2
..0....1....1....2....1....1...-1....1...-2...-2....0....1...-1....0....2...-2
CROSSREFS
Sequence in context: A167572 A147476 A146675 * A294138 A207824 A179900
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 06 2011
STATUS
approved