A041816 - OEIS

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A041816 as a simple table

n	a(n)
0	20
1	21
2	62
3	145
4	1367
5	1512
6	19511
7	21023
8	208718
9	438459
10	1085636
11	1524095
12	62049436
13	63573531
14	189196498
15	441966527
16	4166895241
17	4608861768
18	59473236457
19	64082098225
20	636212120482
21	1336506339189

[20,21,62,145,1367,1512,19511,21023,208718,438459, 1085636,1524095,62049436,63573531,189196498, 441966527,4166895241,4608861768,59473236457, 64082098225,636212120482,1336506339189]