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A055354
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Number of labeled mobiles (circular rooted trees) with n nodes and 7 leaves.
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2
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5760, 940896, 85049280, 5731545600, 324745027200, 16481262283200, 778208622871680, 35036455255401600, 1529404526377728000, 65498410076875776000, 2775672164602681344000, 117137057625636739891200
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OFFSET
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8,1
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LINKS
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MATHEMATICA
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m = 20; L[x_] = Log[1 - x] + O[x]^m // Normal; A[_] = 0;
Do[A[x_] = x y - x L[A[x]] + O[x]^k // Normal // Expand, {k, m}];
Drop[(SeriesCoefficient[#, {y, 0, 7}] & /@ CoefficientList[A[x], x]) * Range[0, m - 1]!, 8] (* Jean-François Alcover, Nov 01 2019 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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