A001405 - OEIS

A001405 as a simple table

n	a(n)
0	1
1	1
2	2
3	3
4	6
5	10
6	20
7	35
8	70
9	126
10	252
11	462
12	924
13	1716
14	3432
15	6435
16	12870
17	24310
18	48620
19	92378
20	184756
21	352716
22	705432
23	1352078
24	2704156
25	5200300
26	10400600
27	20058300
28	40116600
29	77558760
30	155117520
31	300540195
32	601080390
33	1166803110

[1,1,2,3,6,10,20,35,70,126,252,462,924,1716,3432, 6435,12870,24310,48620,92378,184756,352716,705432, 1352078,2704156,5200300,10400600,20058300, 40116600,77558760,155117520,300540195,601080390, 1166803110]

[1,1,2,3,6,10,20,35,70,126,252,462,924,1716,3432,
 6435,12870,24310,48620,92378,184756,352716,705432,
 1352078,2704156,5200300,10400600,20058300,
 40116600,77558760,155117520,300540195,601080390,
 1166803110]