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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 519 |
| 3 | 8078 |
| 4 | 114617 |
| 5 | 1539720 |
| 6 | 19981483 |
| 7 | 253451506 |
| 8 | 3165132333 |
| 9 | 39098271212 |
| 10 | 479245678847 |
| 11 | 5841627343734 |
| 12 | 70916047801249 |
| 13 | 858343285202704 |
| 14 | 10366285999237011 |
| 15 | 124990982044693562 |
| 16 | 1505251989334074965 |
[1,28,519,8078,114617,1539720,19981483,253451506, 3165132333,39098271212,479245678847,5841627343734, 70916047801249,858343285202704,10366285999237011, 124990982044693562,1505251989334074965] |