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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 16 |
| 4 | 67 |
| 5 | 374 |
| 6 | 2825 |
| 7 | 29212 |
| 8 | 417199 |
| 9 | 8283458 |
| 10 | 229755605 |
| 11 | 8933488744 |
| 12 | 488176700923 |
| 13 | 37558989808526 |
| 14 | 4073773336877345 |
| 15 | 623476476706836148 |
| 16 | 134732283882873635911 |
| 17 | 41128995468748254231002 |
| 18 | 17741753171749626840952685 |
| 19 | 10817161765507572862559462656 |
[1,2,5,16,67,374,2825,29212,417199,8283458, 229755605,8933488744,488176700923,37558989808526, 4073773336877345,623476476706836148, 134732283882873635911,41128995468748254231002, 17741753171749626840952685, 10817161765507572862559462656] |