A024723 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)=2.

1, 1, 2, 2, 2, 2, 6, 10, 14, 26, 50, 90, 162, 290, 582, 1090, 2006, 3794, 7458, 14306, 27074, 51762, 103062, 200410, 385070, 747274, 1492050, 2929754, 5702258, 11151778, 22397270, 44268562, 86834790, 171256770, 344480610, 684714338, 1352345666

Offset

1,3

Links

Table of n, a(n) for n=1..37.

Crossrefs

Sequence in context: A323442 A078014 A063867 * A035470 A061292 A138068

Adjacent sequences: A024720 A024721 A024722 * A024724 A024725 A024726

Keyword

nonn

Author

Clark Kimberling

Status

approved