Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A103370
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A103370 Row sums of triangle A095801 (matrix square of the Narayana triangle A001263). +0
3
1, 3, 12, 57, 303, 1743, 10629, 67791, 448023, 3047745, 21235140, 150969195, 1091936745, 8016114681, 59616180828, 448459155063, 3407842605039, 26131449100821, 202011445055436, 1573171285950639, 12333030718989969 (list; graph; listen)
OFFSET

1,2

COMMENT

Equals A008277 * A000108, i.e. the product of the Stirling2 triangle and the Catalan series starting (1, 2, 5, 14, 42,...). - Gary W. Adamson (qntmpkt(AT)yahoo.com), Jan 31 2008

PROGRAM

(PARI) {a(n)=if(n<1, 0, sum(k=1, n, (matrix(n, n, m, j, binomial(m-1, j-1)*binomial(m, j-1)/j)^2)[n, k]))}

CROSSREFS

Cf. A095801, A001263.

Cf. A008277, A000108.

Sequence in context: A101106 A133158 A047891 this_sequence A094149 A117107 A128326

Adjacent sequences: A103367 A103368 A103369 this_sequence A103371 A103372 A103373

KEYWORD

nonn

AUTHOR

Paul D. Hanna (pauldhanna(AT)juno.com), Feb 02 2005

page 1

Search completed in 0.005 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 07:41 EDT 2008. Contains 142293 sequences.


AT&T Labs Research