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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 94 |
| 4 | 239 |
| 5 | 8452 |
| 6 | 22082 |
| 7 | 814456 |
| 8 | 2039996 |
| 9 | 70397968 |
| 10 | 188494088 |
| 11 | 7204148704 |
| 12 | 17411854064 |
| 13 | 564493160512 |
| 14 | 1609094722592 |
| 15 | 66749699364736 |
| 16 | 148601207638976 |
| 17 | 4059354394263808 |
| 18 | 13738060802150528 |
| 19 | 679354561023860224 |
[1,3,94,239,8452,22082,814456,2039996,70397968, 188494088,7204148704,17411854064,564493160512, 1609094722592,66749699364736,148601207638976, 4059354394263808,13738060802150528, 679354561023860224] |