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A023893 Number of partitions of n into prime power parts (1 included); number of nonisomorphic Abelian subgroups of symmetric group S_n. 9
1, 1, 2, 3, 5, 7, 10, 14, 20, 27, 36, 48, 63, 82, 105, 134, 171, 215, 269, 335, 415, 511, 626, 764, 929, 1125, 1356, 1631, 1953, 2333, 2776, 3296, 3903, 4608, 5427, 6377, 7476, 8744, 10205, 11886, 13818, 16032, 18565, 21463, 24768, 28536 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

FORMULA

G.f.: Prod(p prime, Prod(k >= 1, 1/(1-x^(p^k)))) / (1-x)

CROSSREFS

Cf. A009490, A023894.

Cf. A018819, A062051, A131995.

Sequence in context: A155167 A116634 A035960 * A065094 A094023 A123630

Adjacent sequences:  A023890 A023891 A023892 * A023894 A023895 A023896

KEYWORD

nonn

AUTHOR

Olivier Gerard (olivier.gerard(AT)gmail.com)

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.