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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 103 |
| 5 | 796 |
| 6 | 7104 |
| 7 | 71807 |
| 8 | 810239 |
| 9 | 10095145 |
| 10 | 137686648 |
| 11 | 2040943180 |
| 12 | 32679948256 |
| 13 | 562281127266 |
| 14 | 10347659040127 |
| 15 | 202849692259846 |
| 16 | 4220573966037231 |
| 17 | 92900793975348826 |
| 18 | 2156973952747274733 |
| 19 | 52686155932369860221 |
| 20 | 1350605860832381895768 |
| 21 | 36256679580764579284889 |
[1,3,16,103,796,7104,71807,810239,10095145, 137686648,2040943180,32679948256,562281127266, 10347659040127,202849692259846,4220573966037231, 92900793975348826,2156973952747274733, 52686155932369860221,1350605860832381895768, 36256679580764579284889] |