A046646 - cp's OEIS frontend

A046646 a(n) = 2binomial(3n-3, n-1)/(2*n-1) for n >= 2, and a(1) = 1.

n	a(n)
1	1
2	2
3	6
4	24
5	110
6	546
7	2856
8	15504
9	86526
10	493350
11	2861430
12	16829280
13	100134216
14	601661144
15	3645533040
16	22249511328
17	136657509918
18	844061090670
19	5239262085330
20	32665844580600
21	204480219795390
22	1284624902435490

[1, 2, 6, 24, 110, 546, 2856, 15504, 86526, 493350, 2861430, 16829280, 100134216, 601661144, 3645533040, 22249511328, 136657509918, 844061090670, 5239262085330, 32665844580600, 204480219795390, 1284624902435490]

cp's OEIS Frontend

A046646 a(n) = 2binomial(3n-3, n-1)/(2*n-1) for n >= 2, and a(1) = 1.

Table of values

List of values

cp's OEIS Frontend

A046646 a(n) = 2*binomial(3*n-3, n-1)/(2*n-1) for n >= 2, and a(1) = 1.

Table of values

List of values

A046646 a(n) = 2binomial(3n-3, n-1)/(2*n-1) for n >= 2, and a(1) = 1.