| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 13 |
| 4 | 373 |
| 5 | 24061 |
| 6 | 3430021 |
| 7 | 1085594413 |
| 8 | 765444156373 |
| 9 | 1199327541421981 |
| 10 | 4150826776751106181 |
| 11 | 31511604323119334675053 |
| 12 | 521181162682913685911315413 |
| 13 | 18663030289006900328937074926621 |
[0,1,1,13,373,24061,3430021,1085594413, 765444156373,1199327541421981,4150826776751106181, 31511604323119334675053, 521181162682913685911315413, 18663030289006900328937074926621] |