A171450 Sequence with Hankel transform given by 2^C(n,2)*2^floor(n/3).

1, 1, 2, 5, 15, 54, 231, 1133, 6082, 34397, 200063, 1180798, 7023103, 41946973, 251144922, 1505966757, 9040214223, 54314351878, 326565963479, 1964805696525, 11828911080050, 71258494789421, 429525155047263, 2590571415647886

Offset: 0

Author

Paul Barry, Dec 09 2009

Keywords

• easy
• nonn

Comments

Hankel transform is A171451.

Formula

G.f.: 1/(1-x/(1-x/(1-x/(1-2x/(1-2x/(1-2x/(1-x/(1-x/(1-x/(1-2x/(1-... (continued fraction).