| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 635 |
| 3 | 10835 |
| 4 | 166851 |
| 5 | 2407971 |
| 6 | 33252835 |
| 7 | 445002595 |
| 8 | 5818890851 |
| 9 | 74768679011 |
| 10 | 947871169635 |
| 11 | 11890741318755 |
| 12 | 147930305201251 |
| 13 | 1828206048535651 |
| 14 | 22473922782504035 |
| 15 | 275081786101769315 |
[1,31,635,10835,166851,2407971,33252835,445002595, 5818890851,74768679011,947871169635, 11890741318755,147930305201251,1828206048535651, 22473922782504035,275081786101769315] |