A197446 - OEIS

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A197446 as a simple table

n	a(n)
1	4
2	36
3	474
4	4837
5	52117
6	585194
7	6455759
8	71202438
9	787298158
10	8700460833
11	96129107870
12	1062244177133
13	11737953179188
14	129703872646573
15	1433228960340464
16	15837211757913841
17	175001375414696401

[4,36,474,4837,52117,585194,6455759,71202438, 787298158,8700460833,96129107870,1062244177133, 11737953179188,129703872646573,1433228960340464, 15837211757913841,175001375414696401]