A118747 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A118747 as a simple table

n	a(n)
1	2
2	6
3	30
4	210
5	1470
6	16170
7	210210
8	2732730
9	46456410
10	882671790
11	16770764010
12	385727572230
13	8871734161290
14	204049885709670
15	5917446685580430
16	183440847252993330
17	5686666264842793230
18	176286654210126590130

[2,6,30,210,1470,16170,210210,2732730,46456410, 882671790,16770764010,385727572230,8871734161290, 204049885709670,5917446685580430, 183440847252993330,5686666264842793230, 176286654210126590130]