id:A097081 - OEIS Search Results

Search: id:A097081

Displaying 1-1 of 1 results found.

page 1

Sum C(n,4k)2^k, k = 0 . . n.

+0
1

1, 1, 1, 1, 3, 11, 31, 71, 145, 289, 601, 1321, 2979, 6683, 14743, 32111, 69697, 151777, 332113, 728689, 1598883, 3503627, 7668079, 16774775, 36704017, 80343361, 175916521, 385196761, 843365379, 1846290395, 4041672871, 8847607391 (list; graph; listen)

	OFFSET	`0,5`
	FORMULA	`G.f. : (1-x)^3/((1-x)^4-2x^4); a(n)=sum{k=0..floor(n/2), binomial(n, 4k)2^k }; a(n)=4a(n-1)-6a(n-2)+4a(n-3)+a(n-4).`
	CROSSREFS	`Cf. A093406.` `Sequence in context: A057172 A071568 A093406 this_sequence A107587 A087323 A034543` `Adjacent sequences: A097078 A097079 A097080 this_sequence A097082 A097083 A097084`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jul 23 2004`

page 1

Search completed in 0.002 seconds

Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

AT&T Labs Research