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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 62 |
| 3 | 377 |
| 4 | 2232 |
| 5 | 13015 |
| 6 | 75898 |
| 7 | 444014 |
| 8 | 2601503 |
| 9 | 15244128 |
| 10 | 89303905 |
| 11 | 523084546 |
| 12 | 3063814838 |
| 13 | 17945741321 |
| 14 | 105115487400 |
| 15 | 615706236199 |
| 16 | 3606449444722 |
| 17 | 21124456768934 |
| 18 | 123734572586495 |
| 19 | 724763983514112 |
| 20 | 4245239506761217 |
| 21 | 24866107799273146 |
| 22 | 145650985218990062 |
[1,10,62,377,2232,13015,75898,444014,2601503, 15244128,89303905,523084546,3063814838, 17945741321,105115487400,615706236199, 3606449444722,21124456768934,123734572586495, 724763983514112,4245239506761217, 24866107799273146,145650985218990062] |