A249891 - cp's OEIS frontend

A249891 G.f.: Sum_{n>=0} x^n / (1+x)^(2n+1) [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * (-x)^k].

n	a(n)
0	1
1	-1
2	-11
3	59
4	241
5	-3361
6	-419
7	172451
8	-575399
9	-7443481
10	58900909
11	216416771
12	-4229184959
13	2577683471
14	244556409709
15	-1057605544621
16	-11063790445559
17	106391247022391
18	291287267857021
19	-7745138594921101
20	10707792104722681
21	449533741924068119
22	-2373288757544551451

[1, -1, -11, 59, 241, -3361, -419, 172451, -575399, -7443481, 58900909, 216416771, -4229184959, 2577683471, 244556409709, -1057605544621, -11063790445559, 106391247022391, 291287267857021, -7745138594921101, 10707792104722681, 449533741924068119, -2373288757544551451]

cp's OEIS Frontend

A249891 G.f.: Sum_{n>=0} x^n / (1+x)^(2n+1) [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * (-x)^k].

Table of values

List of values

cp's OEIS Frontend

A249891 G.f.: Sum_{n>=0} x^n / (1+x)^(2*n+1) * [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * (-x)^k].

Table of values

List of values

A249891 G.f.: Sum_{n>=0} x^n / (1+x)^(2n+1) [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * (-x)^k].