A181147 - cp's OEIS frontend

A181147 a(n) = Sum_{k=0..n-1} (105k+44)C(2k,k)^2T(k)(-1)^(n-1-k)/(2nC(2n,n)), where T(k) (k=0,1,2,...) are central trinomial coefficients given by A002426.

n	a(n)
1	11
2	23
3	224
4	1747
5	16754
6	162392
7	1651206
8	17126327
9	181182446
10	1943132842
11	21080299228
12	230802972664
13	2546569337336
14	28280754214358
15	315824396838386
16	3544003431783795
17	39936833763112790
18	451718158386620678

[11, 23, 224, 1747, 16754, 162392, 1651206, 17126327, 181182446, 1943132842, 21080299228, 230802972664, 2546569337336, 28280754214358, 315824396838386, 3544003431783795, 39936833763112790, 451718158386620678]

cp's OEIS Frontend

A181147 a(n) = Sum_{k=0..n-1} (105k+44)C(2k,k)^2T(k)(-1)^(n-1-k)/(2nC(2n,n)), where T(k) (k=0,1,2,...) are central trinomial coefficients given by A002426.

Table of values

List of values

cp's OEIS Frontend

A181147 a(n) = Sum_{k=0..n-1} (105k+44)*C(2k,k)^2*T(k)*(-1)^(n-1-k)/(2n*C(2n,n)), where T(k) (k=0,1,2,...) are central trinomial coefficients given by A002426.

Table of values

List of values

A181147 a(n) = Sum_{k=0..n-1} (105k+44)C(2k,k)^2T(k)(-1)^(n-1-k)/(2nC(2n,n)), where T(k) (k=0,1,2,...) are central trinomial coefficients given by A002426.