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| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 800 |
| 3 | 6654 |
| 4 | 98438 |
| 5 | 528980 |
| 6 | 5663798 |
| 7 | 25652956 |
| 8 | 245171384 |
| 9 | 1013801118 |
| 10 | 9371493930 |
| 11 | 36493683322 |
| 12 | 338859534762 |
| 13 | 1258923096090 |
| 14 | 11981816150524 |
| 15 | 42692770908886 |
| 16 | 421365884931922 |
| 17 | 1442510986422868 |
| 18 | 14867064750007770 |
[20,800,6654,98438,528980,5663798,25652956, 245171384,1013801118,9371493930,36493683322, 338859534762,1258923096090,11981816150524, 42692770908886,421365884931922,1442510986422868, 14867064750007770] |