A052227 - cp's OEIS frontend

A052227 a(n) = (4n+1)binomial(3n,n)/(2n+1).

n	a(n)
0	1
1	5
2	27
3	156
4	935
5	5733
6	35700
7	224808
8	1427679
9	9126975
10	58659315
11	378658800
12	2453288292
13	15944020316
14	103897691640
15	678610095504
16	4441369072335
17	29120107628115
18	191233066114545
19	1257635016353100

[1, 5, 27, 156, 935, 5733, 35700, 224808, 1427679, 9126975, 58659315, 378658800, 2453288292, 15944020316, 103897691640, 678610095504, 4441369072335, 29120107628115, 191233066114545, 1257635016353100]

cp's OEIS Frontend

A052227 a(n) = (4n+1)binomial(3n,n)/(2n+1).

Table of values

List of values

cp's OEIS Frontend

A052227 a(n) = (4*n+1)*binomial(3*n,n)/(2*n+1).

Table of values

List of values

A052227 a(n) = (4n+1)binomial(3n,n)/(2n+1).