A166899 - cp's OEIS frontend

A166899 a(n) = Sum_{k=0..[n/2]} C(n-k,k)^4*n/(n-k), n>=1.

n	a(n)
1	1
2	3
3	25
4	111
5	456
6	2697
7	15961
8	86247
9	495781
10	3003738
11	17946798
12	107667969
13	660458787
14	4081397547
15	25274724105
16	157744019799
17	991384251102
18	6254115981009
19	39613066988527
20	252017709962526
21	1608980424431755

[1, 3, 25, 111, 456, 2697, 15961, 86247, 495781, 3003738, 17946798, 107667969, 660458787, 4081397547, 25274724105, 157744019799, 991384251102, 6254115981009, 39613066988527, 252017709962526, 1608980424431755]

cp's OEIS Frontend

A166899 a(n) = Sum_{k=0..[n/2]} C(n-k,k)^4*n/(n-k), n>=1.

Table of values

List of values