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A019266
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Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for square lattice.
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1
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1, 0, 4, 12, 56, 280, 1488, 8232, 47008, 274824, 1636520, 9890584, 60510480, 374019776, 2332131872, 14651535840, 92653845120, 589317728376, 3767523372432, 24196006128592, 156030800105840, 1009911004804296, 6558631830442384, 42723991459518368, 279091277437885920
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OFFSET
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0,3
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LINKS
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FORMULA
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MATHEMATICA
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(Length@FindCycle[{NearestNeighborGraph[Tuples[Range[2 # + 4], 2], {All, 1.}], {#+2, #+2}}, {2 #}, All]) & /@ Range[11] (* Gabriel B. Apolinario, Jan 07 2017 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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Georg Thimm (mgeorg(AT)ntu.edu.sg)
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EXTENSIONS
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STATUS
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approved
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