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Search: id:A055349
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| A055349 |
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Triangle of labeled mobiles (circular rooted trees) with n nodes and k leaves. |
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+0
8
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| 1, 2, 0, 6, 3, 0, 24, 36, 8, 0, 120, 360, 220, 30, 0, 720, 3600, 4200, 1500, 144, 0, 5040, 37800, 71400, 47250, 11508, 840, 0, 40320, 423360, 1176000, 1234800, 545664, 98784, 5760, 0, 362880, 5080320, 19474560, 29635200, 20469456, 6618528
(list; table; graph; listen)
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OFFSET
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1,2
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LINKS
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Index entries for sequences related to mobiles
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FORMULA
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E.g.f. satisfies A(x, y)=xy-x*log(1-A(x, y))-x.
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EXAMPLE
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1; 2,0; 6,3,0; 24,36,8,0; 120,360,220,30,0; ...
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CROSSREFS
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Row sums give A038037. Columns 1 through 8: A000142, A055303, A055350-A055355.
Sequence in context: A095834 A106828 A055302 this_sequence A161174 A136656 A131595
Adjacent sequences: A055346 A055347 A055348 this_sequence A055350 A055351 A055352
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KEYWORD
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nonn,tabl,eigen
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net), May 15 2000
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