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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 148 |
| 3 | 41618 |
| 4 | 16699380 |
| 5 | 8039989002 |
| 6 | 4339892975512 |
| 7 | 2535604038015218 |
| 8 | 1570273521448103668 |
| 9 | 1016915629343040544250 |
| 10 | 682308706348352869913148 |
| 11 | 471167961102713571612302730 |
| 12 | 333217453890900855796193690520 |
| 13 | 240438319207137787818120695999370 |
[1,2,148,41618,16699380,8039989002,4339892975512, 2535604038015218,1570273521448103668, 1016915629343040544250,682308706348352869913148, 471167961102713571612302730, 333217453890900855796193690520, 240438319207137787818120695999370] |