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A092485 Expansion of Product_{m=>1} (1+m*(m+1)*q^m). 2
1, 2, 6, 24, 44, 142, 366, 800, 1636, 4338, 10154, 18968, 42368, 80726, 183914, 401096, 729944, 1402098, 2829814, 5172416, 10600836, 21582558, 37732782, 70148512, 127184636, 236798322, 416265730, 804045376, 1514022088, 2581172630 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Sum of product of i(i+1)-transform of terms in all partitions of n into distinct parts.

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..1000

EXAMPLE

The partitions of 6 into distinct parts are 6, 1+5, 2+4, 1+2+3, the corresponding i(i+1)-transforms are of products 6*7, 2*5*6, 2*3*4*5, 2*2*3*3*4, so 42, 60, 120, 144 and their sum is a(6) = 366.

MATHEMATICA

Take[ CoefficientList[ Expand[ Product[1 + m(m + 1)q^m, {m, 1000}]], q], 30] - Robert G. Wilson v, Apr 05 2004

CROSSREFS

Cf. A022629, A265836.

Sequence in context: A192196 A000496 A004306 * A113904 A099144 A189851

Adjacent sequences:  A092482 A092483 A092484 * A092486 A092487 A092488

KEYWORD

nonn

AUTHOR

Jon Perry, Apr 04 2004

EXTENSIONS

More terms from Robert G. Wilson v, Apr 05 2004

STATUS

approved

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Last modified January 26 01:48 EST 2020. Contains 331270 sequences. (Running on oeis4.)