The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A247639 Dimensions of algebraic generators of combinatorial Hopf algebra H(Heap_2). 0
 1, 5, 31, 210, 1488, 10826, 80111, 599671, 4525573, 34357725, 262011295, 2004962487, 15383479300 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS J.-P. Bultel, S. Giraudo, Combinatorial Hopf algebras from PROs, arXiv preprint arXiv:1406.6903 [math.CO], 2014-2016. [DOI] MATHEMATICA terms = 11; c[g_, t_] := c[g, t] = Sum[c[g, n, t], {n, 0, 3 terms}]; c[g_, n_, t_] := c[g, n, t] = P[g, n, t] - Sum[c[g, k, t] P[g, n-k-1, t], {k, 0, n - 1}]; P[g_, n_, t_] := 1/F[g, n, t]; F[g_, n_, t_] := F[g, n, t] = If[n<=g, 1, F[g, n-1, t] - t F[g, n-g-1, t]]; Rest[CoefficientList[1 - 1/c[2, t] + O[t]^(terms + 1), t]][[1 ;; terms]] (* Jean-François Alcover, Jul 25 2018 *) CROSSREFS Sequence in context: A337928 A178792 A007197 * A002649 A104091 A153292 Adjacent sequences: A247636 A247637 A247638 * A247640 A247641 A247642 KEYWORD nonn,more AUTHOR N. J. A. Sloane, Sep 21 2014 EXTENSIONS a(12)-a(13) from Robert G. Wilson v, Jul 25 2018 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 7 02:40 EST 2023. Contains 360111 sequences. (Running on oeis4.)