Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A132341
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A132341 Main diagonal of A132339. +0
2
1, 2, 10, 168, 4290, 136136 (list; graph; listen)
OFFSET

0,2

REFERENCES

G. Kreweras, Sur une classe de problemes de denombrement lies au treillis des partitions des entiers, Cahiers du Bureau Universitaire de Recherche Op\'{e}rationnelle, Institut de Statistique, Universit\'{e} de Paris, 6 (1965), circa p. 82.

FORMULA

a(n) is found by setting h=k=n in A(n,k) = 2(-1)^(h+k) (h+k-1)! (2h+2k-3)! / ( h! k! (2h-1)! (2k-1)! ), h >= 0, k >= 0.

CROSSREFS

Sequence in context: A007131 A126449 A126451 this_sequence A069994 A063573 A086675

Adjacent sequences: A132338 A132339 A132340 this_sequence A132342 A132343 A132344

KEYWORD

nonn,easy,more

AUTHOR

njas, Nov 08 2007

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified December 3 01:16 EST 2008. Contains 151161 sequences.


AT&T Labs Research