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A008675 Expansion of 1/( Product_{j=0..5} (1-x^(2*j+1)) ). 2
1, 1, 1, 2, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 21, 25, 29, 34, 40, 46, 53, 62, 70, 80, 91, 103, 116, 131, 147, 164, 184, 204, 227, 252, 278, 307, 339, 372, 408, 448, 489, 534, 583, 634, 689, 749, 811, 878, 950, 1025, 1106, 1192, 1282, 1378, 1481, 1588, 1702, 1823, 1949, 2083 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

Number of partitions of n into parts 1, 3, 5, 7, 9, and 11. - Joerg Arndt, Jul 09 2013

Number of partitions (d1,d2,...,d6) of n such that 0 <= d1/1 <= d2/2 <= ... <= d6/6. - Seiichi Manyama, Jun 04 2017

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..10000 (terms 0..1000 from Vincenzo Librandi)

INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 246

Index entries for linear recurrences with constant coefficients, signature (1, 0, 1, -1, 1, -1, 1, -2, 2, -2, 2, -3, 2, -2, 3, -3, 3, -2, 3, -3, 3, -2, 2, -3, 2, -2, 2, -2, 1, -1, 1, -1, 1, 0, 1, -1).

MAPLE

seq(coeff(series(1/mul(1-x^(2*j+1), j=0..5), x, n+1), x, n), n = 0..65); # G. C. Greubel, Sep 08 2019

MATHEMATICA

CoefficientList[Series[1/((1-x)(1-x^3)(1-x^5)(1-x^7)(1-x^9)(1-x^11)), {x, 0, 65}], x] (* Vincenzo Librandi, Jun 23 2013 *)

PROG

(PARI) a(n)=(46200*((n\3+1)*[2, -1, -1][n%3+1]+[10, -4, -7][n%3+1]) +3*n^5+ 270*n^4+9005*n^3+136350*n^2+908260*n+3603600)\3742200  \\ Tani Akinari, Jul 09 2013

(PARI) Vec(1/((1-x)*(1-x^3)*(1-x^5)*(1-x^7)*(1-x^9)*(1-x^11))+O(x^66)) \\ Joerg Arndt, Jul 09 2013

(MAGMA) R<x>:=PowerSeriesRing(Integers(), 65); Coefficients(R!( 1/&*[1-x^(2*j+1): j in [0..5]] )); // G. C. Greubel, Sep 08 2019

(Sage)

def A008674_list(prec):

    P.<x> = PowerSeriesRing(ZZ, prec)

    return P( 1/prod(1-x^(2*j+1) for j in (0..5)) ).list()

A008674_list(65) # G. C. Greubel, Sep 08 2019

CROSSREFS

Cf. A259094.

Sequence in context: A174246 A083847 A034142 * A027581 A058706 A034143

Adjacent sequences:  A008672 A008673 A008674 * A008676 A008677 A008678

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

Typo in name fixed by Vincenzo Librandi, Jun 23 2013

STATUS

approved

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Last modified April 10 02:39 EDT 2020. Contains 333392 sequences. (Running on oeis4.)