A024959 a(n) = Sum_{i=1..floor((n+2)/4)} a(2i-1)*a(n-2i+1), with a(1)=a(3)=2 and a(2)=1.

2, 1, 2, 4, 8, 20, 48, 112, 264, 688, 1760, 4432, 11136, 30208, 80160, 209344, 547584, 1498752, 4052224, 10840064, 28972416, 80315136, 220124160, 597656576, 1623036928, 4522262528, 12503194624, 34330329088, 94172397568, 264205592576, 735690285056

Offset

1,1

Links

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

Crossrefs

Sequence in context: A325843 A024739 A359689 * A029728 A135547 A146307

Adjacent sequences: A024956 A024957 A024958 * A024960 A024961 A024962

Keyword

nonn

Author

Clark Kimberling

Extensions

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

Status

approved