A000765 - OEIS

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A000765 as a simple table

n	a(n)
0	1
1	4
2	36
3	308
4	2764
5	25404
6	237164
7	2237948
8	21286548
9	203701772
10	1958748676
11	18908954324
12	183135542956
13	1778581016076
14	17314029758828
15	168891863875652

[1,4,36,308,2764,25404,237164,2237948,21286548, 203701772,1958748676,18908954324,183135542956, 1778581016076,17314029758828,168891863875652]