A136731 - OEIS

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A136731 as a simple table

n	a(n)
0	1
1	2
2	5
3	23
4	175
5	1935
6	28432
7	523290
8	11587072
9	299942890
10	8886126540
11	296438370794
12	10993731095695
13	448604373236731
14	19971257117211555
15	963142501803505255
16	50015707804752012825
17	2782336529985704607295

[1,2,5,23,175,1935,28432,523290,11587072, 299942890,8886126540,296438370794,10993731095695, 448604373236731,19971257117211555, 963142501803505255,50015707804752012825, 2782336529985704607295]