A024739 a(n) = Sum_{i=1..floor((n+1)/4)} a(2*i-1) * a(n-2*i+1), with a(1)=a(3)=2 and a(2)=1.

2, 1, 2, 4, 8, 16, 40, 96, 224, 528, 1376, 3520, 8864, 22272, 59648, 156992, 407808, 1060864, 2872960, 7701504, 20460032, 54299904, 148601856, 402977792, 1084414464, 2918055936, 8035600384, 21980652544, 59769698304, 162381037568, 449715144704

Offset

1,1

Links

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

Crossrefs

Sequence in context: A049903 A325665 A325843 * A359689 A024959 A029728

Adjacent sequences: A024736 A024737 A024738 * A024740 A024741 A024742

Keyword

nonn

Author

Clark Kimberling

Extensions

a(26) corrected by Sean A. Irvine, Jul 21 2019

Status

approved