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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 20 |
| 3 | 246 |
| 4 | 4481 |
| 5 | 107129 |
| 6 | 3157836 |
| 7 | 110504876 |
| 8 | 4473749677 |
| 9 | 205615442135 |
| 10 | 10574135574388 |
| 11 | 601527803412298 |
| 12 | 37500537926181449 |
| 13 | 2542321872054610333 |
| 14 | 186209553386691383388 |
| 15 | 14653121207168215024624 |
| 16 | 1232879877057607865696085 |
| 17 | 110444572988776439826640683 |
[1,3,20,246,4481,107129,3157836,110504876, 4473749677,205615442135,10574135574388, 601527803412298,37500537926181449, 2542321872054610333,186209553386691383388, 14653121207168215024624,1232879877057607865696085, 110444572988776439826640683] |