A127115 - 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

A127115 as a simple table

n	a(n)
0	1
1	1
2	2
3	6
4	30
5	170
6	1320
7	11660
8	116600
9	1304600
10	15657400
11	230212400
12	3443176000
13	56312146000
14	1211416624000
15	23016735654000
16	460356735300000
17	12067735663300000
18	265756631234600000
19	6601271140642200000

[1,1,2,6,30,170,1320,11660,116600,1304600, 15657400,230212400,3443176000,56312146000, 1211416624000,23016735654000,460356735300000, 12067735663300000,265756631234600000, 6601271140642200000]