A246511 - cp's OEIS frontend

A246511 a(n) = (Sum_{k=0..n-1} (-1)^k(2k+1)C(n-1,k)^2C(n+k,k)^2)/n, where C(n,k) denotes the binomial coefficient n!/(k!(n-k)!).

n	a(n)
1	1
2	-13
3	103
4	219
5	-26139
6	503957
7	-4066061
8	-54914149
9	2550230113
10	-43157232273
11	192777017511
12	10118180981037
13	-318814450789587
14	4344955121014089
15	6807591584551563
16	-1781238363905009253
17	42912636577174295769
18	-425791821468024981709
19	-5452095049517604924017
20	305524943325956601071159

[1, -13, 103, 219, -26139, 503957, -4066061, -54914149, 2550230113, -43157232273, 192777017511, 10118180981037, -318814450789587, 4344955121014089, 6807591584551563, -1781238363905009253, 42912636577174295769, -425791821468024981709, -5452095049517604924017, 305524943325956601071159]

cp's OEIS Frontend

A246511 a(n) = (Sum_{k=0..n-1} (-1)^k(2k+1)C(n-1,k)^2C(n+k,k)^2)/n, where C(n,k) denotes the binomial coefficient n!/(k!(n-k)!).

Table of values

List of values

cp's OEIS Frontend

A246511 a(n) = (Sum_{k=0..n-1} (-1)^k*(2k+1)*C(n-1,k)^2*C(n+k,k)^2)/n, where C(n,k) denotes the binomial coefficient n!/(k!*(n-k)!).

Table of values

List of values

A246511 a(n) = (Sum_{k=0..n-1} (-1)^k(2k+1)C(n-1,k)^2C(n+k,k)^2)/n, where C(n,k) denotes the binomial coefficient n!/(k!(n-k)!).