A072331 - cp's OEIS frontend

A072331 a(n) = 2^(n-1) * Sum_{k=0..n} ((n+k)!/(n-k)!)/k!.

n	a(n)
1	3
2	38
3	772
4	21768
5	786736
6	34703456
7	1807726656
8	108602413184
9	7392195003136
10	562241229891072
11	47257832090862592
12	4349969517278922752
13	435185983056255725568
14	47017486048144734052352

[3, 38, 772, 21768, 786736, 34703456, 1807726656, 108602413184, 7392195003136, 562241229891072, 47257832090862592, 4349969517278922752, 435185983056255725568, 47017486048144734052352]

cp's OEIS Frontend

A072331 a(n) = 2^(n-1) * Sum_{k=0..n} ((n+k)!/(n-k)!)/k!.

Table of values

List of values