A323207 - cp's OEIS frontend

A323207 a(n) = Sum_{k=0..n} hypergeometric([-k, k + 1], [-k - 1], n - k).

n	a(n)
0	1
1	2
2	4
3	10
4	33
5	141
6	752
7	4825
8	36027
9	305132
10	2879840
11	29909421
12	338479429
13	4139716658
14	54339861530
15	761150445734
16	11322139144239
17	178116143657889
18	2952831190016238
19	51423702126549166
20	938126972940647197
21	17883424301972473339

[1, 2, 4, 10, 33, 141, 752, 4825, 36027, 305132, 2879840, 29909421, 338479429, 4139716658, 54339861530, 761150445734, 11322139144239, 178116143657889, 2952831190016238, 51423702126549166, 938126972940647197, 17883424301972473339]

cp's OEIS Frontend

A323207 a(n) = Sum_{k=0..n} hypergeometric([-k, k + 1], [-k - 1], n - k).

Table of values

List of values