A001448 - cp's OEIS frontend

A001448 a(n) = binomial(4n,2n) or (4n)!/((2n)!(2n)!).

n	a(n)
0	1
1	6
2	70
3	924
4	12870
5	184756
6	2704156
7	40116600
8	601080390
9	9075135300
10	137846528820
11	2104098963720
12	32247603683100
13	495918532948104
14	7648690600760440
15	118264581564861424
16	1832624140942590534
17	28453041475240576740
18	442512540276836779204
19	6892620648693261354600

[1, 6, 70, 924, 12870, 184756, 2704156, 40116600, 601080390, 9075135300, 137846528820, 2104098963720, 32247603683100, 495918532948104, 7648690600760440, 118264581564861424, 1832624140942590534, 28453041475240576740, 442512540276836779204, 6892620648693261354600]

cp's OEIS Frontend

A001448 a(n) = binomial(4n,2n) or (4n)!/((2n)!(2n)!).

Table of values

List of values

cp's OEIS Frontend

A001448 a(n) = binomial(4n,2n) or (4*n)!/((2*n)!*(2*n)!).

Table of values

List of values

A001448 a(n) = binomial(4n,2n) or (4n)!/((2n)!(2n)!).