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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 21 |
| 3 | 144 |
| 4 | 711 |
| 5 | 4747 |
| 6 | 29767 |
| 7 | 205078 |
| 8 | 1409645 |
| 9 | 10043729 |
| 10 | 72216773 |
| 11 | 528438373 |
| 12 | 3903255409 |
| 13 | 29138576719 |
| 14 | 219209569841 |
| 15 | 1661343858524 |
| 16 | 12668020020047 |
| 17 | 97135000445375 |
| 18 | 748428139988567 |
| 19 | 5792032911677831 |
| 20 | 45000447097568843 |
[1,10,21,144,711,4747,29767,205078,1409645, 10043729,72216773,528438373,3903255409, 29138576719,219209569841,1661343858524, 12668020020047,97135000445375,748428139988567, 5792032911677831,45000447097568843] |