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 A202047 T(n,k)=Number of zero-sum nXk -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors 8
 1, 3, 3, 7, 19, 7, 19, 73, 73, 19, 51, 335, 415, 335, 51, 141, 1593, 2921, 2921, 1593, 141, 393, 7669, 19541, 31753, 19541, 7669, 393, 1107, 37311, 149149, 359017, 359017, 149149, 37311, 1107, 3139, 184335, 1067983, 4188917, 6221993, 4188917, 1067983 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Table starts ....1.......3.........7.........19..........51..........141..........393 ....3......19........73........335........1593.........7669........37311 ....7......73.......415.......2921.......19541.......149149......1067983 ...19.....335......2921......31753......359017......4188917.....49553277 ...51....1593.....19541.....359017.....6221993....119412837...2229078023 ..141....7669....149149....4188917...119412837...3573771563.108356007319 ..393...37311...1067983...49553277..2229078023.108356007319 .1107..184335...8193025..594443301.43322352587 .3139..919889..60897081.7206865523 .8953.4620477.469758219 LINKS R. H. Hardin, Table of n, a(n) for n = 1..84 EXAMPLE Some solutions for n=5 k=3 .-1.-1.-1....1..1..1....0.-1.-1....1..0..0...-1.-1..1....1.-1.-1....1..1..0 ..0..0.-1...-1.-1..0....1..1..1....1..0..0....1..1.-1...-1.-1..0....1..1..0 ..0..0..1...-1.-1..0....1.-1.-1...-1..0..0....1..1.-1....0..0..0...-1.-1..0 ..0..0..1....1..1..1....1.-1..0...-1.-1.-1....0..0..0....1..1..0...-1.-1.-1 ..1..1..0...-1.-1..0....1.-1..0....0..1..1...-1..0..0...-1..1..1...-1..1..1 CROSSREFS Column 1 is A002426 Sequence in context: A221303 A221378 A221269 * A036574 A174034 A081486 Adjacent sequences:  A202044 A202045 A202046 * A202048 A202049 A202050 KEYWORD nonn,tabl AUTHOR R. H. Hardin Dec 10 2011 STATUS approved

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Last modified April 20 14:27 EDT 2019. Contains 322310 sequences. (Running on oeis4.)