| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 19 |
| 5 | 23 |
| 6 | 939 |
| 7 | 962 |
| 8 | 9597 |
| 9 | 39350 |
| 10 | 88297 |
| 11 | 127647 |
| 12 | 2003002 |
| 13 | 4133651 |
| 14 | 51606814 |
| 15 | 55740465 |
| 16 | 1222156579 |
| 17 | 1277897044 |
| 18 | 22946406327 |
| 19 | 1194491026048 |
| 20 | 3606419484471 |
| 21 | 4800910510519 |
| 22 | 32411882547585 |
[1,1,3,4,19,23,939,962,9597,39350,88297,127647, 2003002,4133651,51606814,55740465,1222156579, 1277897044,22946406327,1194491026048, 3606419484471,4800910510519,32411882547585] |