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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 89 |
| 3 | 1278 |
| 4 | 26738 |
| 5 | 517881 |
| 6 | 10171315 |
| 7 | 199243634 |
| 8 | 3906605183 |
| 9 | 76569060586 |
| 10 | 1500957422222 |
| 11 | 29421452263473 |
| 12 | 576720342887239 |
| 13 | 11304856454549226 |
| 14 | 221597668862377866 |
| 15 | 4343754040692960588 |
| 16 | 85146204614736790139 |
| 17 | 1669034648958758680516 |
| 18 | 32716392842324236695259 |
[1,1,89,1278,26738,517881,10171315,199243634, 3906605183,76569060586,1500957422222, 29421452263473,576720342887239,11304856454549226, 221597668862377866,4343754040692960588, 85146204614736790139,1669034648958758680516, 32716392842324236695259] |