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Search: id:A121545
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| A121545 |
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Coefficients of Taylor series expansion of the operad Prim L. |
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+0
1
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| 0, 1, 1, 4, 17, 81, 412, 2192, 12049, 67891, 390041, 2276176, 13455356, 80402284, 484865032, 2947107384, 18036248337, 111046920567, 687345582787, 4274642610932, 26697307240777, 167377288848977
(list; graph; listen)
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OFFSET
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0,4
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REFERENCES
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Philippe Leroux, An equivalence of categories motivated by weighted directed graphs, arXiv:math-ph/0709.3453.
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LINKS
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Olivier Gerard, Table of n, a(n) for n = 0..50
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FORMULA
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G.f.: sin^2( (1/3)*arcsin(sqrt(27*x/4)) ) / ( 3/4 + sin^2( (1/3)*arcsin(sqrt(27*x/4)) )).
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CROSSREFS
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Cf. A006013.
Sequence in context: A089165 A056096 A151250 this_sequence A078845 A110771 A082028
Adjacent sequences: A121542 A121543 A121544 this_sequence A121546 A121547 A121548
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Oct 07 2007
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EXTENSIONS
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More terms from Olivier Gerard (olivier.gerard(AT)gmail.com), Oct 11 2007
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