A006632 - cp's OEIS frontend

A006632 a(n) = 3binomial(4n-1, n-1)/(4*n-1).

n	a(n)
1	1
2	3
3	15
4	91
5	612
6	4389
7	32890
8	254475
9	2017356
10	16301164
11	133767543
12	1111731933
13	9338434700
14	79155435870
15	676196049060
16	5815796869995
17	50318860986108
18	437662920058980
19	3824609516638444
20	33563127932394060
21	295655735395397520
22	2613391671568320765

[1, 3, 15, 91, 612, 4389, 32890, 254475, 2017356, 16301164, 133767543, 1111731933, 9338434700, 79155435870, 676196049060, 5815796869995, 50318860986108, 437662920058980, 3824609516638444, 33563127932394060, 295655735395397520, 2613391671568320765]

cp's OEIS Frontend

A006632 a(n) = 3binomial(4n-1, n-1)/(4*n-1).

Table of values

List of values

cp's OEIS Frontend

A006632 a(n) = 3*binomial(4*n-1, n-1)/(4*n-1).

Table of values

List of values

A006632 a(n) = 3binomial(4n-1, n-1)/(4*n-1).