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 A220718 T(n,k)=Number of ways to reciprocally link elements of an nXk array either to themselves or to exactly two king-move neighbors, without consecutive collinear links 6
 1, 1, 1, 1, 8, 1, 1, 26, 26, 1, 1, 118, 226, 118, 1, 1, 463, 2243, 2243, 463, 1, 1, 1930, 21195, 72923, 21195, 1930, 1, 1, 7843, 201598, 2126423, 2126423, 201598, 7843, 1, 1, 32209, 1913495, 63806966, 168897201, 63806966, 1913495, 32209, 1, 1, 131698 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Table starts .1.......1..........1.............1..............1...............1 .1.......8.........26...........118............463............1930 .1......26........226..........2243..........21195..........201598 .1.....118.......2243.........72923........2126423........63806966 .1.....463......21195.......2126423......168897201.....14158198781 .1....1930.....201598......63806966....14158198781...3503850286857 .1....7843....1913495....1902974315..1166906554415.837962999003819 .1...32209...18172469...56814065240.96567512189416 .1..131698..172565016.1695753689937 .1..539466.1638746380 .1.2208130 .1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..84 EXAMPLE Some solutions for n=3 k=4 0=self 1=nw 2=n 3=ne 4=w 6=e 7=sw 8=s 9=se (reciprocal directions total 10) .00.69.47.00...68.48.69.47...00.69.47.00...69.49.00.00...00.68.47.00 .68.34.17.78...29.27.39.17...69.34.16.47...00.17.17.78...00.23.69.48 .26.34.36.24...36.14.36.14...00.16.34.00...36.34.36.24...00.00.00.12 CROSSREFS Sequence in context: A155452 A147295 A174388 * A176283 A323324 A181543 Adjacent sequences:  A220715 A220716 A220717 * A220719 A220720 A220721 KEYWORD nonn,tabl AUTHOR R. H. Hardin Dec 18 2012 STATUS approved

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Last modified January 18 02:50 EST 2022. Contains 350410 sequences. (Running on oeis4.)