A100666 - OEIS

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A100666 as a simple table

n	a(n)
0	3
1	3
2	7
3	21
4	79
5	357
6	1879
7	11277
8	75967
9	567381
10	4652071
11	41534493
12	401057935
13	4164175845
14	46260731384
15	547489559470
16	6876483788377
17	91352567576937
18	1279774932585453
19	18855298837939164
20	291449116254193528

[3,3,7,21,79,357,1879,11277,75967,567381,4652071, 41534493,401057935,4164175845,46260731384, 547489559470,6876483788377,91352567576937, 1279774932585453,18855298837939164, 291449116254193528]