login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A162736 G.f. is the polynomial (Product_{k=1..30} (1 - x^(3*k)))/(1-x)^30. 2
1, 30, 465, 4959, 40890, 277791, 1618199, 8306730, 38329299, 161383520, 627356796, 2272915164, 7734020120, 24874638204, 76028550900, 221849950497, 620471946324, 1669004265525, 4330837858674, 10869702783150, 26449453637412 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

This is a row of the triangle in A162499. Only finitely many terms are nonzero.

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..1365 (terms 0..1000 from Harvey P. Dale)

MATHEMATICA

CoefficientList[Series[Times@@(1-x^Range[3, 90, 3])/(1-x)^30, {x, 0, 20}], x] (* Harvey P. Dale, Oct 04 2011 *)

PROG

(PARI) x='x+O('x^50); A = prod(k=1, 30, (1-x^(3*k)))/(1-x)^30; Vec(A) \\ G. C. Greubel, Jul 07 2018

(MAGMA) m:=50; R<x>:=PowerSeriesRing(Integers(), m); F:=(&*[(1-x^(3*k)): k in [1..30]])/(1-x)^30; Coefficients(R!(F)); // G. C. Greubel, Jul 07 2018

CROSSREFS

Sequence in context: A161573 A161976 A162377 * A010982 A022594 A321955

Adjacent sequences:  A162733 A162734 A162735 * A162737 A162738 A162739

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 02 2009

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 April 19 07:11 EDT 2019. Contains 322237 sequences. (Running on oeis4.)