A064622 - OEIS

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A064622 as a simple table

n	a(n)
1	1
2	2
3	3
4	6
5	7
6	19
7	34
8	67
9	102
10	115
11	190
12	2066
13	24381
14	24398
15	24399
16	36130540
17	409493529
18	3744514071
19	17951662018
20	71184216405

[1,2,3,6,7,19,34,67,102,115,190,2066,24381,24398, 24399,36130540,409493529,3744514071,17951662018, 71184216405]