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 A202041 Number of zero-sum nX2 -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors 1
 3, 19, 73, 335, 1593, 7669, 37311, 184335, 919889, 4620477, 23332387, 118371541, 602858159, 3080279011, 15782030681, 81053501795, 417143999201, 2150782607289, 11107401645291, 57445755808701, 297487456185331, 1542374070100235 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A202047 LINKS R. H. Hardin, Table of n, a(n) for n = 1..93 EXAMPLE Some solutions for n=7 ..0..1....0..1...-1.-1....1..0...-1..0...-1..0....1.-1....1..1...-1..1....1..1 .-1.-1....1..1...-1.-1....0..0....1..0....1..1...-1..1...-1..1...-1..0....0.-1 ..1..1....0..0....1.-1...-1.-1....1..0...-1.-1...-1..1...-1..1...-1..0....0.-1 ..0..0....0..0....1..0....1..1....1..0....1.-1...-1..0....1..1....0..0....1..1 ..1.-1....0.-1....1..0....0..1...-1.-1....1.-1....0..0...-1.-1....0..1....1.-1 ..1.-1...-1.-1....1..1....0..0...-1.-1....1.-1....0..0...-1.-1....0..1...-1.-1 .-1..0....0..0....0..0...-1.-1....1..1....0..1....0..1....0..0...-1..1....0..0 CROSSREFS Sequence in context: A090698 A350713 A215802 * A245507 A247059 A243142 Adjacent sequences: A202038 A202039 A202040 * A202042 A202043 A202044 KEYWORD nonn AUTHOR R. H. Hardin Dec 10 2011 STATUS approved

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Last modified September 12 23:44 EDT 2024. Contains 375855 sequences. (Running on oeis4.)