A246459 - cp's OEIS frontend

A246459 a(n) = Sum_{k=0..n} C(n,k)^2C(2k,k)(2k+1), where C(n,k) denotes the binomial coefficient n!/(k!*(n-k)!).

n	a(n)
0	1
1	7
2	55
3	465
4	4047
5	35673
6	316521
7	2819295
8	25173855
9	225157881
10	2016242265
11	18070920255
12	162071863425
13	1454320387575
14	13055422263255
15	117237213829953
16	1053070838993151
17	9461217421304505
18	85019389336077225
19	764113545253570191
20	6868417199986308129

[1, 7, 55, 465, 4047, 35673, 316521, 2819295, 25173855, 225157881, 2016242265, 18070920255, 162071863425, 1454320387575, 13055422263255, 117237213829953, 1053070838993151, 9461217421304505, 85019389336077225, 764113545253570191, 6868417199986308129]

cp's OEIS Frontend

A246459 a(n) = Sum_{k=0..n} C(n,k)^2C(2k,k)(2k+1), where C(n,k) denotes the binomial coefficient n!/(k!*(n-k)!).

Table of values

List of values

cp's OEIS Frontend

A246459 a(n) = Sum_{k=0..n} C(n,k)^2*C(2k,k)*(2k+1), where C(n,k) denotes the binomial coefficient n!/(k!*(n-k)!).

Table of values

List of values

A246459 a(n) = Sum_{k=0..n} C(n,k)^2C(2k,k)(2k+1), where C(n,k) denotes the binomial coefficient n!/(k!*(n-k)!).