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A024737 a(n) = Sum_{i=1..floor((n+1)/4)} a(2*i-1) * a(n-2*i+1), with a(1)=3 and a(2)=a(3)=1. 1
3, 1, 1, 3, 9, 27, 84, 261, 810, 2514, 8046, 25704, 81975, 261261, 854037, 2784540, 9057393, 29439855, 97650930, 323099676, 1066565907, 3517004046, 11791407663, 39431809098, 131550859650, 438453827928, 1481254263945, 4993010577093 (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: A112508 A260883 A088749 * A024958 A014516 A247306

Adjacent sequences:  A024734 A024735 A024736 * A024738 A024739 A024740

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified June 28 02:57 EDT 2022. Contains 354903 sequences. (Running on oeis4.)