A048117 a(n)=(1/2)*T(2n,n), where T is given by A048113.

1, 2, 6, 18, 60, 204, 720, 2580, 9408, 34668, 129024, 483672, 1824768, 6919752, 26357976, 100778472, 386591304, 1487221056, 5735785176, 22170562656, 85866332760, 333151068528, 1294658562912, 5038469947992, 19634243736168

Offset

2,2

Links

Table of n, a(n) for n=2..26.

Crossrefs

Sequence in context: A005631 A118677 A150043 * A048118 A004113 A150044

Adjacent sequences: A048114 A048115 A048116 * A048118 A048119 A048120

Keyword

nonn

Author

Clark Kimberling

Status

approved