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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 13 |
| 3 | 340 |
| 4 | 13713 |
| 5 | 752516 |
| 6 | 52372051 |
| 7 | 4421017602 |
| 8 | 438996446545 |
| 9 | 50142716621848 |
| 10 | 6477138263806011 |
| 11 | 933667525669154486 |
| 12 | 148582199464010331289 |
| 13 | 25874197258988478298068 |
| 14 | 4894174597530612144797299 |
| 15 | 999256176035969437218129946 |
| 16 | 219035687330062179838536993441 |
[1,1,13,340,13713,752516,52372051,4421017602, 438996446545,50142716621848,6477138263806011, 933667525669154486,148582199464010331289, 25874197258988478298068,4894174597530612144797299, 999256176035969437218129946, 219035687330062179838536993441] |