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A060099 G.f.: 1/((1-x^2)^3*(1-x)^4). 3
1, 4, 13, 32, 71, 140, 259, 448, 742, 1176, 1806, 2688, 3906, 5544, 7722, 10560, 14223, 18876, 24739, 32032, 41041, 52052, 65429, 81536, 100828, 123760, 150892, 182784, 220116, 263568, 313956, 372096, 438957, 515508, 602889, 702240, 814891, 942172, 1085623 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Fourth column (m=3) of triangle A060098.

Partial sums of A038163.

Equals the tetrahedral numbers, [1, 4, 10, 20,...] convolved with the aerated triangular numbers, [1, 0, 3, 0, 6, 0, 10,...]. [Gary W. Adamson, Jun 11 2009]

REFERENCES

B. Broer, Hilbert series for modules of covariants, in Algebraic Groups and Their Generalizations..., Proc. Sympos. Pure Math., 56 (1994), Part I, 321-331. See p. 329.

LINKS

Peter J. C. Moses, Table of n, a(n) for n = 0..9999

Index entries for linear recurrences with constant coefficients, signature (4,-3,-8,14,0,-14,8,3,-4,1).

FORMULA

a(n) = sum(A060098(n+3, 3)).

G.f.: 1/((1-x)^7*(1+x)^3).

MATHEMATICA

a[n_]:=If[OddQ[n], ((1+n) (3+n) (5+n)^2 (7+n) (9+n))/5760, ((2+n) (4+n) (6+n) (8+n) (15+10 n+n^2))/5760]; Map[a, Range[0, 100]] (* Peter J. C. Moses, Mar 24 2013 *)

CoefficientList[Series[1/((1-x^2)^3*(1-x)^4), {x, 0, 100}], x] (* Peter J. C. Moses, Mar 24 2013 *)

CROSSREFS

Cf. A002620, A002624, A096338.

Cf. A001752 (for the similar series 1/((1-x)^4*(1-x^2))).

Cf. A028346 (for the similar series 1/((1-x)^4*(1-x^2)^2)).

Sequence in context: A011936 A037235 A051912 * A208638 A173277 A036420

Adjacent sequences:  A060096 A060097 A060098 * A060100 A060101 A060102

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang, Apr 06 2001

STATUS

approved

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Last modified November 21 17:44 EST 2017. Contains 295004 sequences.