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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A023019 Number of partitions of n into parts of 21 kinds. 1
1, 21, 252, 2233, 16170, 100926, 560945, 2837418, 13266099, 57994475, 239170239, 937026279, 3507380170, 12601619226, 43628951025, 146036139347, 473924014599, 1494785958435, 4591920193357, 13764656869425, 40328218603134 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n) is the Euler transform of A010860. - Alois P. Heinz, Oct 17 2008

LINKS

Table of n, a(n) for n=0..20.

N. J. A. Sloane, Transforms [From Alois P. Heinz, Oct 17 2008]

Index entries for expansions of Product_{k >= 1} (1-x^k)^m

MAPLE

with (numtheory): a:= proc(n) option remember; `if`(n=0, 1, add (add (d*21, d=divisors(j)) *a(n-j), j=1..n)/n) end: seq (a(n), n=0..40); # Alois P. Heinz, Oct 17 2008

CROSSREFS

Cf. 21st column of A144064. - Alois P. Heinz, Oct 17 2008

Sequence in context: A165095 A165099 A165108 * A036220 A022649 A165094

Adjacent sequences:  A023016 A023017 A023018 * A023020 A023021 A023022

KEYWORD

nonn

AUTHOR

David W. Wilson, Jun 14 1998

STATUS

approved

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

Content is available under The OEIS End-User License Agreement .

Last modified December 22 07:03 EST 2014. Contains 252328 sequences.