A049022 Recurring combinations: a(n) = C(a(n-1),a(n-2)).

2, 4, 6, 15, 5005, 23197529289205687077586038842122627336104000

Offset

0,1

Comments

The next term has 200700 digits. - Harvey P. Dale, Aug 14 2011

Links

Table of n, a(n) for n=0..5.

Mathematica

Transpose[NestList[{Last[#], Binomial[Last[#], First[#]]}&, {2, 4}, 6]] [[1]] (* Harvey P. Dale, Aug 14 2011 *)

Crossrefs

Sequence in context: A217525 A295615 A127679 * A209867 A136033 A343019

Adjacent sequences: A049019 A049020 A049021 * A049023 A049024 A049025

Keyword

nonn,nice,easy

Author

Floor van Lamoen

Status

approved