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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 88 |
| 4 | 275 |
| 5 | 1233 |
| 6 | 10234 |
| 7 | 65363 |
| 8 | 355573 |
| 9 | 2194764 |
| 10 | 14070932 |
| 11 | 85652323 |
| 12 | 519260961 |
| 13 | 3211470573 |
| 14 | 19819925799 |
| 15 | 121490746063 |
| 16 | 746218947635 |
| 17 | 4593161224590 |
| 18 | 28240298397593 |
| 19 | 173532774710365 |
| 20 | 1066882947565281 |
| 21 | 6559955677759270 |
[1,7,88,275,1233,10234,65363,355573,2194764, 14070932,85652323,519260961,3211470573, 19819925799,121490746063,746218947635, 4593161224590,28240298397593,173532774710365, 1066882947565281,6559955677759270] |