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A201803
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T(n,k)=Number of zero-sum nXk -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors
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8
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1, 5, 5, 19, 85, 19, 85, 455, 455, 85, 381, 3617, 4057, 3617, 381, 1751, 28625, 48335, 48335, 28625, 1751, 8135, 235827, 562961, 988589, 562961, 235827, 8135, 38165, 1972115, 7099021, 20960485, 20960485, 7099021, 1972115, 38165, 180325, 16703881
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OFFSET
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1,2
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COMMENTS
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Table starts
......1.........5.........19..........85.........381........1751..........8135
......5........85........455........3617.......28625......235827.......1972115
.....19.......455.......4057.......48335......562961.....7099021......90062519
.....85......3617......48335......988589....20960485...472565771...10857153407
....381.....28625.....562961....20960485...722587629.27941324053.1077779765471
...1751....235827....7099021...472565771.27941324053
...8135...1972115...90062519.10857153407
..38165..16703881.1168520339
.180325.142672901
.856945
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LINKS
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EXAMPLE
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Some solutions for n=4 k=3
.-1..1.-2....2..2.-2...-2..2..2....0..1..2....0..1..1....2..0..0....0.-1..2
.-1..1..1...-2..2.-2....2..2..2...-2..1..1...-1.-1..1....1..0..0....1.-1.-1
..0..1..1...-2..2.-2...-2.-2.-2...-2..1..1...-1.-1.-1....1.-1.-1....1..1..1
..0..0.-1...-1..2..1....1.-2.-1...-1.-1.-1....2..2.-2...-2.-1..1...-1.-1.-1
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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