| n | a(n) |
|---|---|
| 1 | 646 |
| 2 | 4007 |
| 3 | 21955 |
| 4 | 111175 |
| 5 | 542834 |
| 6 | 2592734 |
| 7 | 12238954 |
| 8 | 57388086 |
| 9 | 268220043 |
| 10 | 1251995646 |
| 11 | 5843762848 |
| 12 | 27293152949 |
| 13 | 127596737815 |
| 14 | 597184294909 |
| 15 | 2798100377112 |
| 16 | 13124265846109 |
| 17 | 61616682850586 |
| 18 | 289522081723318 |
[646,4007,21955,111175,542834,2592734,12238954, 57388086,268220043,1251995646,5843762848, 27293152949,127596737815,597184294909, 2798100377112,13124265846109,61616682850586, 289522081723318] |