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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 15 |
| 3 | 30 |
| 4 | 114 |
| 5 | 522 |
| 6 | 2529 |
| 7 | 12636 |
| 8 | 69744 |
| 9 | 405168 |
| 10 | 2449773 |
| 11 | 15261150 |
| 12 | 97808574 |
| 13 | 641284110 |
| 14 | 4287838548 |
| 15 | 29153498904 |
| 16 | 201163103922 |
| 17 | 1406107987374 |
| 18 | 9941935540692 |
| 19 | 71017384630734 |
| 20 | 511976000663130 |
| 21 | 3721663648494978 |
| 22 | 27257992426100979 |
| 23 | 201015705767041110 |
| 24 | 1491738880927589808 |
| 25 | 11134231701698352462 |
| 26 | 83548054037756075397 |
[6,15,30,114,522,2529,12636,69744,405168,2449773, 15261150,97808574,641284110,4287838548, 29153498904,201163103922,1406107987374, 9941935540692,71017384630734,511976000663130, 3721663648494978,27257992426100979, 201015705767041110,1491738880927589808, 11134231701698352462,83548054037756075397] |