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| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 196 |
| 3 | 2070 |
| 4 | 21512 |
| 5 | 224794 |
| 6 | 2225355 |
| 7 | 20434119 |
| 8 | 175334420 |
| 9 | 1420391511 |
| 10 | 10944254668 |
| 11 | 80614381602 |
| 12 | 569751343450 |
| 13 | 3874457650832 |
| 14 | 25407226592596 |
| 15 | 160974645721734 |
| 16 | 987110279457981 |
| 17 | 5867881503628732 |
| 18 | 33865515790471949 |
[20,196,2070,21512,224794,2225355,20434119, 175334420,1420391511,10944254668,80614381602, 569751343450,3874457650832,25407226592596, 160974645721734,987110279457981,5867881503628732, 33865515790471949] |