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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 20 |
| 3 | 166 |
| 4 | 2664 |
| 5 | 42634 |
| 6 | 682156 |
| 7 | 10914510 |
| 8 | 349264336 |
| 9 | 11176458770 |
| 10 | 357646680660 |
| 11 | 11444693781142 |
| 12 | 366230200996568 |
| 13 | 11719366431890202 |
| 14 | 375019725820486492 |
| 15 | 12000631226255567774 |
| 16 | 768040398480356337568 |
| 17 | 49154585502742805604386 |
[2,20,166,2664,42634,682156,10914510,349264336, 11176458770,357646680660,11444693781142, 366230200996568,11719366431890202, 375019725820486492,12000631226255567774, 768040398480356337568,49154585502742805604386] |