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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 38 |
| 4 | 347 |
| 5 | 3507 |
| 6 | 37788 |
| 7 | 425490 |
| 8 | 4947239 |
| 9 | 58944743 |
| 10 | 715930085 |
| 11 | 8831390152 |
| 12 | 110340491380 |
| 13 | 1393446215956 |
| 14 | 17758187064360 |
| 15 | 228091606247322 |
| 16 | 2949707761133535 |
| 17 | 38374765966463775 |
| 18 | 501891882459954495 |
| 19 | 6595106960772794310 |
| 20 | 87030030852121334835 |
| 21 | 1152846885317408648715 |
[1,5,38,347,3507,37788,425490,4947239,58944743, 715930085,8831390152,110340491380,1393446215956, 17758187064360,228091606247322,2949707761133535, 38374765966463775,501891882459954495, 6595106960772794310,87030030852121334835, 1152846885317408648715] |