A024963 a(n) = Sum_{i=1..floor((n+2)/4)} a(2i-1)*a(n-2i+1), with a(1)=3, a(2)=1, and a(3)=2.

3, 1, 2, 6, 18, 58, 186, 594, 1898, 6390, 21402, 71350, 237522, 824130, 2840594, 9735090, 33326370, 117518870, 412260450, 1439364870, 5017074450, 17912831754, 63634522842, 225032003602, 794803982874, 2859133321638, 10244767026810, 36572931177942

Offset

1,1

Links

Table of n, a(n) for n=1..28.

Crossrefs

Sequence in context: A166197 A010279 A024743 * A283435 A212737 A307078

Adjacent sequences: A024960 A024961 A024962 * A024964 A024965 A024966

Keyword

nonn

Author

Clark Kimberling

Extensions

Offset corrected and title improved by Sean A. Irvine, Jul 30 2019

Status

approved