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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
OFFSET
1,3
CROSSREFS
Sequence in context: A346621 A116571 A054641 * A195504 A098537 A276861
KEYWORD
nonn
STATUS
approved