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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 31 |
| 3 | 258 |
| 4 | 2702 |
| 5 | 33821 |
| 6 | 492978 |
| 7 | 8198218 |
| 8 | 153136209 |
| 9 | 3173544162 |
| 10 | 72241986729 |
| 11 | 1791612993205 |
| 12 | 48074653669593 |
| 13 | 1387590910289915 |
| 14 | 42863756641047136 |
| 15 | 1410904918289665343 |
| 16 | 49296029555617568097 |
| 17 | 1822020250023113834772 |
| 18 | 71023629427964322798782 |
[1,5,31,258,2702,33821,492978,8198218,153136209, 3173544162,72241986729,1791612993205, 48074653669593,1387590910289915,42863756641047136, 1410904918289665343,49296029555617568097, 1822020250023113834772,71023629427964322798782] |