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| n | a(n) |
|---|---|
| 1 | 2689 |
| 2 | 2489 |
| 3 | 7425 |
| 4 | 21819 |
| 5 | 73925 |
| 6 | 249530 |
| 7 | 762761 |
| 8 | 2632409 |
| 9 | 8914507 |
| 10 | 27372795 |
| 11 | 94998346 |
| 12 | 322904419 |
| 13 | 993656452 |
| 14 | 3455998240 |
| 15 | 11770408787 |
| 16 | 36264169184 |
| 17 | 126262279153 |
| 18 | 430441032877 |
| 19 | 1326978762037 |
| 20 | 4622666039941 |
| 21 | 15766722542299 |
[2689,2489,7425,21819,73925,249530,762761,2632409, 8914507,27372795,94998346,322904419,993656452, 3455998240,11770408787,36264169184,126262279153, 430441032877,1326978762037,4622666039941, 15766722542299] |