A048119 a(n)=(1/2)*T(2n+1,n+1), where T is given by A048113.

1, 3, 9, 30, 102, 360, 1290, 4704, 17334, 64512, 241836, 912384, 3459876, 13178988, 50389236, 193295652, 743610528, 2867892588, 11085281328, 42933166380, 166575534264, 647329281456, 2519234973996, 9817121868084

Offset

2,2

Links

Table of n, a(n) for n=2..25.

Crossrefs

Sequence in context: A090573 A228339 A257641 * A304823 A317875 A056333

Adjacent sequences: A048116 A048117 A048118 * A048120 A048121 A048122

Keyword

nonn

Author

Clark Kimberling

Status

approved