A191742 - OEIS

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A191742 as a simple table

n	a(n)
1	2
2	6
3	34
4	354
5	6640
6	226090
7	13978062
8	1567580958
9	318961138670
10	117759554854782
11	78883071103925368
12	95874600035087067128
13	211425486715722284229326
14	845949075122781758953188444
15	6141355289964517541296446302562

[2,6,34,354,6640,226090,13978062,1567580958, 318961138670,117759554854782,78883071103925368, 95874600035087067128,211425486715722284229326, 845949075122781758953188444, 6141355289964517541296446302562]