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 A141308 Euler transform of A141307. 2
 2, 7, 36, 283, 2898, 36169, 524976, 8659186, 159736316, 3257811334, 72797444280, 1769125982092, 46466434382032, 1311960028913384, 39633438764146568, 1275742281105759813, 43593785716301112538, 1576217593145774955007 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Dimensions of the graded components of the domain of cocommutativity of the Hopf algebra of free quasi-symmetric functions of level 2. LINKS Vaclav Kotesovec, Table of n, a(n) for n = 1..400 J.-C. Novelli and J.-Y. Thibon, Free quasi-symmetric functions and descent algebras for wreath products and noncommutative multi-symmetric functions, arXiv:0806.3682 [math.CO], 2008. FORMULA a(n) ~ n! * 2^n * (1 - 1/n - 5/(4*n^2) - 21/(4*n^3) - 469/(16*n^4) - 3375/(16*n^5) - 118775/(64*n^6) - 1227535/(64*n^7) - 29026957/(128*n^8) - 385505947/(128*n^9) - 22698285665/(512*n^10)). - Vaclav Kotesovec, Aug 07 2015 MAPLE EULER([seq(c(n), n=1..20)]); # where c(n) is A141307. MATHEMATICA Clear[c]; c[0]=0; c[n_] := c[n] = n! - Sum[k!*c[n-k], {k, 1, n-1}]; Rest[CoefficientList[Series[Product[1/(1 - x^k)^(2^k * c[k]), {k, 1, 20}], {x, 0, 20}], x]] (* Vaclav Kotesovec, Aug 07 2015 *) CROSSREFS Cf. A003319, A141307. Sequence in context: A090352 A123549 A009704 * A185161 A012712 A012363 Adjacent sequences: A141305 A141306 A141307 * A141309 A141310 A141311 KEYWORD nonn AUTHOR Jean-Yves Thibon (jyt(AT)univ-mlv.fr), Jun 26 2008 STATUS approved

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Last modified August 11 04:26 EDT 2024. Contains 375059 sequences. (Running on oeis4.)