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A024731 a(n) = Sum_{i=1..floor((n+1)/4)} a(2*i-1) * a(n-2*i+1), with a(1)=a(2)=1 and a(3)=6. 1
1, 1, 6, 6, 6, 6, 42, 78, 114, 366, 870, 1806, 4470, 10374, 26682, 63510, 151962, 375414, 936294, 2295078, 5570214, 13729974, 35174202, 87526302, 215709522, 540037374, 1388390982, 3485855310, 8700035046, 21930804870, 56696874954, 143383060518 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..32.

CROSSREFS

Sequence in context: A346621 A116571 A054641 * A195504 A098537 A276861

Adjacent sequences:  A024728 A024729 A024730 * A024732 A024733 A024734

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified September 16 08:30 EDT 2021. Contains 347469 sequences. (Running on oeis4.)