A270530 - cp's OEIS frontend

A270530 a(n) = Sum_{k=0..n}((binomial(2k,k)/(k+1)binomial(2*n+2,n-k))).

n	a(n)
0	1
1	5
2	23
3	105
4	484
5	2267
6	10821
7	52705
8	262010
9	1328768
10	6867266
11	36115455
12	192954358
13	1045481465
14	5735154907
15	31802349105
16	178010615678
17	1004542994462
18	5709066033900
19	32646940202200
20	187701954810320

[1, 5, 23, 105, 484, 2267, 10821, 52705, 262010, 1328768, 6867266, 36115455, 192954358, 1045481465, 5735154907, 31802349105, 178010615678, 1004542994462, 5709066033900, 32646940202200, 187701954810320]

cp's OEIS Frontend

A270530 a(n) = Sum_{k=0..n}((binomial(2k,k)/(k+1)binomial(2*n+2,n-k))).

Table of values

List of values

cp's OEIS Frontend

A270530 a(n) = Sum_{k=0..n}((binomial(2*k,k)/(k+1)*binomial(2*n+2,n-k))).

Table of values

List of values

A270530 a(n) = Sum_{k=0..n}((binomial(2k,k)/(k+1)binomial(2*n+2,n-k))).