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

0,3

Comments

Hankel transform is A171451.

Links

Table of n, a(n) for n=0..23.

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).

Crossrefs

Sequence in context: A321958 A107112 A193318 * A204190 A051295 A334154

Adjacent sequences: A171447 A171448 A171449 * A171451 A171452 A171453

Keyword

easy,nonn

Author

Paul Barry, Dec 09 2009

Status

approved