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 A028451 Number of perfect matchings in graph P_{2} X P_{7} X P_{n}. 2
 1, 21, 6272, 880163, 152526845, 24972353440, 4161756233501, 690427159718433, 114725843769441312, 19056798015394695543, 3165986817537284900809, 525966380704787334395776, 87380576637559587656345353, 14516824056706613915897809761, 2411733911295546238838103099168 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS This sequence satisfies a recurrence relation of order 750. - Sergey Perepechko, Jul 11 2019 LINKS Alois P. Heinz, Table of n, a(n) for n = 0..450 Per Hakan Lundow, Computation of matching polynomials and the number of 1-factors in polygraphs, Research report, No 12, 1996, Department of Math., Umea University, Sweden. Per Hakan Lundow, Enumeration of matchings in polygraphs, 1998. A. M. Karavaev and S. N. Perepechko, Dimer problem on two-layer rectangular grid graph, (in Russian) CMMASS'2013 slides Sergey Perepechko, Generating function in Maple notation CROSSREFS Column k=7 of A181206. Sequence in context: A074053 A220552 A275053 * A178327 A231906 A250063 Adjacent sequences:  A028448 A028449 A028450 * A028452 A028453 A028454 KEYWORD nonn AUTHOR STATUS approved

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Last modified November 30 16:23 EST 2021. Contains 349423 sequences. (Running on oeis4.)