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!)
A108457 Number of partitions of (n,n) into pairs (i,j) with i>0, j>=0. 4
1, 1, 3, 8, 23, 60, 161, 404, 1011, 2440, 5804, 13462, 30798, 69082, 152862, 333094, 716781, 1522534, 3198011, 6642274, 13657417, 27805917, 56097811, 112183092, 222496203, 437787036, 854936195, 1657526884, 3191478236, 6104379829, 11602006003, 21916355387 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

(a,b)+(x,y)=(a+x,b+y); unit is (0,0).

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..99

FORMULA

a(n) = A091438(2n,n). - Alois P. Heinz, Sep 24 2018

EXAMPLE

(2,2)=(1,2)+(1,0)=(1,1)+(1,1), so a(2)=3.

CROSSREFS

Main diagonal of A108456.

Cf. A000041, A091438, A108461.

Sequence in context: A027212 A027236 A027244 * A071618 A318861 A318819

Adjacent sequences:  A108454 A108455 A108456 * A108458 A108459 A108460

KEYWORD

nonn

AUTHOR

Christian G. Bower, Jun 03 2005

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 October 23 08:40 EDT 2021. Contains 348211 sequences. (Running on oeis4.)