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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 247 |
| 3 | 4693 |
| 4 | 89167 |
| 5 | 1694173 |
| 6 | 32189287 |
| 7 | 611596453 |
| 8 | 11620332607 |
| 9 | 220786319533 |
| 10 | 4194940071127 |
| 11 | 79703861351413 |
| 12 | 1514373365676847 |
| 13 | 28773093947860093 |
| 14 | 546688785009341767 |
| 15 | 10387086915177493573 |
| 16 | 197354651388372377887 |
| 17 | 3749738376379075179853 |
[1,13,247,4693,89167,1694173,32189287,611596453, 11620332607,220786319533,4194940071127, 79703861351413,1514373365676847,28773093947860093, 546688785009341767,10387086915177493573, 197354651388372377887,3749738376379075179853] |