A024955 a(n) = Sum_{i=1..floor((n+2)/4)} a(2i-1)*a(n-2i+1), with a(1)=a(2)=1 and a(3)=7.

1, 1, 7, 7, 7, 56, 105, 154, 546, 1330, 2800, 7357, 17745, 52192, 129171, 330316, 886809, 2507337, 6683558, 17187443, 46548096, 130632390, 352275462, 938225351, 2562724703, 7217024738, 19723748282, 53440726780, 146510223251, 416055253418, 1145783244340

Offset

1,3

Links

Table of n, a(n) for n=1..31.

Crossrefs

Sequence in context: A242889 A092076 A117981 * A328824 A360080 A352712

Adjacent sequences: A024952 A024953 A024954 * A024956 A024957 A024958

Keyword

nonn

Author

Clark Kimberling

Extensions

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

Status

approved