id:A137645 - OEIS Search Results

Search: id:A137645

Displaying 1-1 of 1 results found.

page 1

a(n) = Sum_{k=0..n} C((n-k)*k, k) * C((n-k)*k, n-k).

+0
1

1, 0, 1, 4, 42, 608, 10986, 240492, 6167112, 181154848, 5995624710, 220711502648, 8943846698096, 395588177834784, 18962600075658460, 979198125493716492, 54189002212286942316, 3199366560075461850320, 200730550064907653703510 (list; graph; listen)

	OFFSET	`0,4`
	PROGRAM	`(PARI) a(n)=sum(k=0, n, binomial((n-k)k, k)binomial((n-k)*k, n-k))`
	CROSSREFS	`Sequence in context: A046719 A092800 A151453 this_sequence A136045 A074768 A140055` `Adjacent sequences: A137642 A137643 A137644 this_sequence A137646 A137647 A137648`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Jan 31 2008`

page 1

Search completed in 0.002 seconds

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

AT&T Labs Research