A033166 - OEIS

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A033166 as a simple table

n	a(n)
1	1
2	4
3	18
4	30
5	428
6	458
7	527
8	542
9	659
10	922
11	1355
12	1817
13	3292
14	4635
15	6841
16	162050
17	197106
18	270086
19	270919
20	344064
21	2079442
22	5492021
23	196362299
24	220581908
25	1292221854
26	5841289122
27	11886461834

[1,4,18,30,428,458,527,542,659,922,1355,1817,3292, 4635,6841,162050,197106,270086,270919,344064, 2079442,5492021,196362299,220581908,1292221854, 5841289122,11886461834]