A113391 - OEIS

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A113391 as a simple table

n	a(n)
0	1
1	9
2	153
3	3621
4	110637
5	4176549
6	188802141
7	9981491997
8	605817292893
9	41590997891929
10	3190816992548889
11	270817573670371995
12	25214094974302894695
13	2556615042094813435491
14	280570514270855698070535

[1,9,153,3621,110637,4176549,188802141,9981491997, 605817292893,41590997891929,3190816992548889, 270817573670371995,25214094974302894695, 2556615042094813435491,280570514270855698070535]