A234040 - cp's OEIS frontend

A234040 a(n) = binomial(2(n+1),n) gcd(n,2)/(2*(n+1)).

n	a(n)
0	1
1	1
2	5
3	7
4	42
5	66
6	429
7	715
8	4862
9	8398
10	58786
11	104006
12	742900
13	1337220
14	9694845
15	17678835
16	129644790
17	238819350
18	1767263190
19	3282060210
20	24466267020
21	45741281820
22	343059613650
23	644952073662
24	4861946401452
25	9183676536076
26	69533550916004

[1, 1, 5, 7, 42, 66, 429, 715, 4862, 8398, 58786, 104006, 742900, 1337220, 9694845, 17678835, 129644790, 238819350, 1767263190, 3282060210, 24466267020, 45741281820, 343059613650, 644952073662, 4861946401452, 9183676536076, 69533550916004]

cp's OEIS Frontend

A234040 a(n) = binomial(2(n+1),n) gcd(n,2)/(2*(n+1)).

Table of values

List of values

cp's OEIS Frontend

A234040 a(n) = binomial(2*(n+1),n) * gcd(n,2)/(2*(n+1)).

Table of values

List of values

A234040 a(n) = binomial(2(n+1),n) gcd(n,2)/(2*(n+1)).