A069723 - cp's OEIS frontend

A069723 a(n) = 2^(n-1)binomial(2n-3, n-1).

n	a(n)
1	1
2	2
3	12
4	80
5	560
6	4032
7	29568
8	219648
9	1647360
10	12446720
11	94595072
12	722362368
13	5538111488
14	42600857600
15	328635187200
16	2541445447680
17	19696202219520
18	152935217233920
19	1189496134041600
20	9265548833587200
21	72271280901980160
22	564404288948797440
23	4412615349963325440

[1, 2, 12, 80, 560, 4032, 29568, 219648, 1647360, 12446720, 94595072, 722362368, 5538111488, 42600857600, 328635187200, 2541445447680, 19696202219520, 152935217233920, 1189496134041600, 9265548833587200, 72271280901980160, 564404288948797440, 4412615349963325440]

cp's OEIS Frontend

A069723 a(n) = 2^(n-1)binomial(2n-3, n-1).

Table of values

List of values

cp's OEIS Frontend

A069723 a(n) = 2^(n-1)*binomial(2*n-3, n-1).

Table of values

List of values

A069723 a(n) = 2^(n-1)binomial(2n-3, n-1).