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A159447
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Number of n-edge-colorings of the second Celmins-Swart Snark.
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1
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0, 0, 0, 0, 2258870796288, 9047768830231276800, 506336252436007271792640, 2604852575650929700554897600, 2901541315803996724909094338560, 1113635084163037955678982524179968, 194993996964612517111634963280691200, 18697739035489738337034253081138308480
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OFFSET
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0,5
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COMMENTS
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The second Celmins-Swart Snark is a cubic graph on 26 vertices and 39 edges with edge chromatic number 4.
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LINKS
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Alois P. Heinz, Table of n, a(n) for n = 0..1000
Weisstein, Eric W. "Celmins-Swart Snarks".
Weisstein, Eric W. "Edge Coloring".
Timme, Marc; van Bussel, Frank; Fliegner, Denny; Stolzenberg, Sebastian (2009) "Counting complex disordered states by efficient pattern matching: chromatic polynomials and Potts partition functions", New J. Phys. 11 023001, doi: 10.1088/1367-2630/11/2/023001.
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FORMULA
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a(n) = n^39 -78*n^38 + ... (see Maple program).
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MAPLE
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a:= n-> n^39 -78*n^38 +2977*n^37 -74100*n^36 +1352640*n^35 -19306594*n^34 +224342277*n^33 -2181791404*n^32 +18118893123*n^31 -130452836327*n^30 +823952578392*n^29 -4608389780429*n^28 +22997509515589*n^27 -103033396258400*n^26 +416525331736816*n^25 -1525737772270530*n^24 +5081295004914867*n^23 -15428507680657788*n^22 +42803369770538734*n^21 -108682235921838363*n^20 +252855988591085175*n^19 -539410912179380029*n^18 +1055315901598357898*n^17 -1892867854923086364*n^16 +3109878686211564875*n^15 -4672808797433106398*n^14 +6406393723078014052*n^13 -7987839935998545020*n^12 +9017573199563822008*n^11 -9162177613893661616*n^10 +8311775652268340640*n^9 -6661120231484154048*n^8 +4648572768670421376*n^7 -2769843755431745280*n^6 +1370525684357079552*n^5 -540501319873105920*n^4 +159143872899272704*n^3 -31049988392951808*n^2 +3004158272716800*n: seq(a(n), n=0..12);
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CROSSREFS
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Cf. A159304.
Sequence in context: A234073 A026081 A159304 * A172598 A321708 A077304
Adjacent sequences: A159444 A159445 A159446 * A159448 A159449 A159450
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KEYWORD
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nonn
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AUTHOR
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Alois P. Heinz, Apr 11 2009
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STATUS
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approved
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