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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 30 |
| 2 | 604 |
| 3 | 12168 |
| 4 | 238848 |
| 5 | 4569624 |
| 6 | 85553528 |
| 7 | 1573583616 |
| 8 | 28524904904 |
| 9 | 510897232692 |
| 10 | 9058858525800 |
| 11 | 159264273415260 |
| 12 | 2779746787907304 |
| 13 | 48213275987175024 |
| 14 | 831677499017068080 |
| 15 | 14277768950229574080 |
| 16 | 244075525406535998808 |
| 17 | 4156705946210758680468 |
[2,30,604,12168,238848,4569624,85553528, 1573583616,28524904904,510897232692,9058858525800, 159264273415260,2779746787907304, 48213275987175024,831677499017068080, 14277768950229574080,244075525406535998808, 4156705946210758680468] |