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A163922 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 30 |
| 3 | 150 |
| 4 | 750 |
| 5 | 3750 |
| 6 | 18735 |
| 7 | 93600 |
| 8 | 467640 |
| 9 | 2336400 |
| 10 | 11673000 |
| 11 | 58320000 |
| 12 | 291375210 |
| 13 | 1455753000 |
| 14 | 7273154040 |
| 15 | 36337737000 |
| 16 | 181548627000 |
| 17 | 907043385000 |
| 18 | 4531720872060 |
| 19 | 22641137570400 |
| 20 | 113118421225440 |
| 21 | 565156109349600 |
[1,6,30,150,750,3750,18735,93600,467640,2336400, 11673000,58320000,291375210,1455753000,7273154040, 36337737000,181548627000,907043385000, 4531720872060,22641137570400,113118421225440, 565156109349600] |