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A008822 Expansion of (1+2*x^2+x^3)/((1-x)^2*(1-x^3)). 0
1, 2, 5, 10, 15, 22, 31, 40, 51, 64, 77, 92, 109, 126, 145, 166, 187, 210, 235, 260, 287, 316, 345, 376, 409, 442, 477, 514, 551, 590, 631, 672, 715, 760, 805, 852, 901, 950, 1001, 1054, 1107, 1162, 1219, 1276 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

Corresponds to the best known lower bound for the tie problem. - Jorg Zurkirchen, Oct 15 2008

REFERENCES

R. Chapman et al., 2-modular lattices from ternary codes, J. Th. des Nombres de Bordeaux, 14 (2002), 73-85.

LINKS

Index entries for Molien series

FORMULA

a(n) = ceil(n * (2n - 1) / 3). - Jorg Zurkirchen, Oct 15 2008

CROSSREFS

Sequence in context: A125622 A080551 A179207 * A013927 A163059 A099738

Adjacent sequences:  A008819 A008820 A008821 * A008823 A008824 A008825

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 17 14:50 EST 2012. Contains 206050 sequences.