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A202130 Number of zero-sum nX1 -3..3 arrays with every element equal to at least one horizontal or vertical neighbor 1
0, 1, 1, 7, 5, 43, 43, 275, 371, 1913, 3017, 14305, 25039, 109803, 212645, 866361, 1818147, 6992905, 15653093, 57383555, 135498383, 477220531, 1177254905, 4012238901, 10256656225, 34031432595, 89553075529, 290731277941 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Column 1 of A202134

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=8

.-2....3...-3....1....3....0...-3....0....0....0...-2...-3...-1...-2....2....0

.-2....3...-3....1....3....0...-3....0....0....0...-2...-3...-1...-2....2....0

..0...-2....3...-2...-2....2....2....3....1...-1...-1....2....3....2....2...-1

..0...-2....3...-2...-2....2....2....3....1...-1...-1....2....3....2....2...-1

..1....1...-3....1....0....0....2....3....0....0....3....0....1....0...-2...-1

..1....1...-3....1....0....0....2...-3....0....0....3....0....1....0...-2...-1

..1...-2....3....0...-1...-2...-1...-3...-1....1....0....1...-3....0...-2....2

..1...-2....3....0...-1...-2...-1...-3...-1....1....0....1...-3....0...-2....2

CROSSREFS

Sequence in context: A142883 A146382 A163742 * A089244 A063003 A038271

Adjacent sequences:  A202127 A202128 A202129 * A202131 A202132 A202133

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 11 2011

STATUS

approved

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Last modified November 27 07:28 EST 2021. Contains 349365 sequences. (Running on oeis4.)