A054108 - cp's OEIS frontend

A054108 a(n) = (-1)^(n+1)Sum_{k=0..n+1}(-1)^kbinomial(2*k,k).

n	a(n)
0	1
1	5
2	15
3	55
4	197
5	727
6	2705
7	10165
8	38455
9	146301
10	559131
11	2145025
12	8255575
13	31861025
14	123256495
15	477823895
16	1855782325
17	7219352975
18	28125910825
19	109720617995
20	428537256445
21	1675561707275
22	6557869020325
23	25689734662775

[1, 5, 15, 55, 197, 727, 2705, 10165, 38455, 146301, 559131, 2145025, 8255575, 31861025, 123256495, 477823895, 1855782325, 7219352975, 28125910825, 109720617995, 428537256445, 1675561707275, 6557869020325, 25689734662775]

cp's OEIS Frontend

A054108 a(n) = (-1)^(n+1)Sum_{k=0..n+1}(-1)^kbinomial(2*k,k).

Table of values

List of values

cp's OEIS Frontend

A054108 a(n) = (-1)^(n+1)*Sum_{k=0..n+1}(-1)^k*binomial(2*k,k).

Table of values

List of values

A054108 a(n) = (-1)^(n+1)Sum_{k=0..n+1}(-1)^kbinomial(2*k,k).