A024722 a(n) = Sum_{i=1..floor((n+1)/4)} a(2*i-1) * a(n-2*i+1), with a(1)=a(2)=1.

1, 1, 1, 1, 1, 1, 2, 3, 4, 6, 10, 16, 25, 39, 67, 110, 177, 289, 494, 828, 1369, 2274, 3927, 6662, 11172, 18834, 32657, 55915, 94911, 161435, 281479, 484998, 829467, 1422452, 2486150, 4306602, 7414386, 12783897, 22416571, 38987381

Offset

1,7

Links

Table of n, a(n) for n=1..40.

Crossrefs

Sequence in context: A143283 A104767 A072944 * A024965 A018142 A173697

Adjacent sequences: A024719 A024720 A024721 * A024723 A024724 A024725

Keyword

nonn

Author

Clark Kimberling

Status

approved