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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 14 |
| 3 | 76 |
| 4 | 435 |
| 5 | 2577 |
| 6 | 15678 |
| 7 | 97272 |
| 8 | 612126 |
| 9 | 3891890 |
| 10 | 24933292 |
| 11 | 160663328 |
| 12 | 1040074684 |
| 13 | 6759228932 |
| 14 | 44075916696 |
| 15 | 288289595968 |
| 16 | 1890894150707 |
| 17 | 12434303045721 |
| 18 | 81960791460442 |
| 19 | 541428229233012 |
| 20 | 3583843659376257 |
[1,3,14,76,435,2577,15678,97272,612126,3891890, 24933292,160663328,1040074684,6759228932, 44075916696,288289595968,1890894150707, 12434303045721,81960791460442,541428229233012, 3583843659376257] |