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A024733
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)=7.
1
1, 1, 7, 7, 7, 7, 56, 105, 154, 546, 1330, 2800, 7357, 17745, 47047, 116480, 290871, 746179, 1926638, 4908876, 12372409, 31662582, 84227577, 217639730, 556964730, 1448423004, 3868816175, 10079702689, 26120574753, 68425502873, 183684723775, 482085719682
OFFSET
1,3
CROSSREFS
Sequence in context: A003880 A084503 A168292 * A252732 A360807 A011472
KEYWORD
nonn
STATUS
approved