A086633 - OEIS

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A086633 as a simple table

n	a(n)
0	1
1	2
2	6
3	28
4	159
5	984
6	6406
7	43222
8	299631
9	2121721
10	15282329
11	111621879
12	824812768
13	6154988092
14	46318172220
15	351105380284
16	2678473144801
17	20548178604408
18	158424726746707

[1,2,6,28,159,984,6406,43222,299631,2121721, 15282329,111621879,824812768,6154988092, 46318172220,351105380284,2678473144801, 20548178604408,158424726746707]