Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A023425
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A023425 Generalized Catalan Numbers. +0
1
1, 1, 1, 1, 1, 2, 5, 13, 34, 90, 241, 652, 1780, 4899, 13581, 37893, 106340, 299978, 850187, 2419788, 6913658, 19822439, 57015620, 164476023, 475752469, 1379553027, 4009532279 (list; graph; listen)
OFFSET

0,6

MATHEMATICA

Clear[ a ]; a[ 0 ]=1; a[ n_Integer ] := a[ n ]=a[ n-1 ]+Sum[ a[ k ]*a[ n-k ], {k, 1, n-4} ];

CROSSREFS

Cf. A000108, A001006, A004148, A006318.

Sequence in context: A097417 A006801 A114173 this_sequence A090827 A109192 A062465

Adjacent sequences: A023422 A023423 A023424 this_sequence A023426 A023427 A023428

KEYWORD

nonn,easy

AUTHOR

Olivier Gerard (ogerard(AT)ext.jussieu.fr)

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 July 25 02:12 EDT 2008. Contains 142294 sequences.


AT&T Labs Research