login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A306706 Expansion of Sum_{k>=0} x^(k*(k+1)/2) / Product_{j=1..k} (1 + x^j)^j. 1
1, 1, -1, 2, -2, 0, 1, 2, -4, -3, 7, 4, -4, -14, 6, 10, 12, -14, 0, -26, 3, 7, 60, 11, -27, -99, -26, 6, 126, 94, 58, -87, -180, -201, -46, 145, 282, 330, 142, -21, -515, -573, -716, -15, 423, 1519, 1128, 1197, -783, -1378, -3264, -1892, -1574, 2155, 2679, 6075, 3376, 3243 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..57.

MATHEMATICA

nmax = 57; CoefficientList[Series[Sum[x^(k (k + 1)/2)/Product[(1 + x^j)^j, {j, 1, k}], {k, 0, nmax}], {x, 0, nmax}], x]

CROSSREFS

Cf. A003406, A206138.

Sequence in context: A079070 A096994 A035370 * A163000 A303548 A105524

Adjacent sequences:  A306703 A306704 A306705 * A306707 A306708 A306709

KEYWORD

sign

AUTHOR

Ilya Gutkovskiy, Mar 05 2019

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 25 04:09 EDT 2021. Contains 345452 sequences. (Running on oeis4.)