A270709 - cp's OEIS frontend

A270709 a(n) = (n+1)Sum_{k=0..(n-1)/2} (binomial(k+1,n-2k-1)binomial(2k,k)/(k+1)^2).

n	a(n)
0	0
1	2
2	3
3	2
4	5
5	7
6	14
7	26
8	51
9	103
10	209
11	435
12	910
13	1930
14	4122
15	8874
16	19227
17	41893
18	91751
19	201839
20	445841
21	988403
22	2198547
23	4905147
24	10974210
25	24615134
26	55341636
27	124694354
28	281525678
29	636802626
30	1442953404
31	3274997130
32	7444505615
33	16946749249

[0, 2, 3, 2, 5, 7, 14, 26, 51, 103, 209, 435, 910, 1930, 4122, 8874, 19227, 41893, 91751, 201839, 445841, 988403, 2198547, 4905147, 10974210, 24615134, 55341636, 124694354, 281525678, 636802626, 1442953404, 3274997130, 7444505615, 16946749249]

cp's OEIS Frontend

A270709 a(n) = (n+1)Sum_{k=0..(n-1)/2} (binomial(k+1,n-2k-1)binomial(2k,k)/(k+1)^2).

Table of values

List of values

cp's OEIS Frontend

A270709 a(n) = (n+1)*Sum_{k=0..(n-1)/2} (binomial(k+1,n-2*k-1)*binomial(2*k,k)/(k+1)^2).

Table of values

List of values

A270709 a(n) = (n+1)Sum_{k=0..(n-1)/2} (binomial(k+1,n-2k-1)binomial(2k,k)/(k+1)^2).