A024958 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 60th year, we have over 367,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A024958

a(n) = Sum_{i=1..floor((n+2)/4)} a(2i-1)*a(n-2i+1), with a(1)=3 and a(2)=a(3)=1.

3, 1, 1, 3, 9, 28, 87, 270, 838, 2682, 8568, 27325, 87087, 284940, 929773, 3026424, 9843471, 32691629, 108290562, 357839667, 1181136576, 3967571310, 13290977466, 44410377199, 148240940865, 501864577470, 1694984858142, 5711630686332 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	LINKS	`Table of n, a(n) for n=1..28.`
	CROSSREFS	`Sequence in context: A260883 A088749 A024737 * A014516 A247306 A016563` `Adjacent sequences: A024955 A024956 A024957 * A024959 A024960 A024961`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling`
	EXTENSIONS	`Offset corrected and title improved by Sean A. Irvine, Jul 30 2019`
	STATUS	`approved`

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 7 21:37 EST 2023. Contains 367662 sequences. (Running on oeis4.)