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A090491 G.f.: (1+x^3+x^4+x^5+x^6+x^9)/((1-x)*(1-x^2)^2*(1-x^3)*(1-x^4)). 0
1, 1, 3, 5, 10, 15, 26, 37, 57, 79, 112, 149, 202, 260, 338, 425, 536, 659, 812, 980, 1184, 1408, 1673, 1963, 2302, 2670, 3094, 3554, 4077, 4642, 5279, 5964, 6730, 7552, 8463, 9438, 10513, 11659, 12915, 14252, 15709, 17256, 18935, 20713, 22635, 24667, 26854 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Molien series for permutation representation of S_4 on pairs of elements from a set of size 4.

REFERENCES

H. Derksen and G. Kemper, Computational Invariant Theory, Springer, 2002; p. 92.

LINKS

Table of n, a(n) for n=0..46.

Index entries for Molien series

CROSSREFS

Sequence in context: A023602 A024452 A074968 * A126728 A070557 A225751

Adjacent sequences:  A090488 A090489 A090490 * A090492 A090493 A090494

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 02 2004

STATUS

approved

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Last modified June 20 02:19 EDT 2013. Contains 226416 sequences.