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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 241 |
| 3 | 6481 |
| 4 | 61681 |
| 5 | 390001 |
| 6 | 1561921 |
| 7 | 5762401 |
| 8 | 15790321 |
| 9 | 42521761 |
| 10 | 93990241 |
| 11 | 214344241 |
| 12 | 399754561 |
| 13 | 815702161 |
| 14 | 1388738641 |
| 15 | 2527596481 |
| 16 | 4042322161 |
| 17 | 6975673921 |
| 18 | 10247744401 |
| 19 | 16983432721 |
| 20 | 24055651681 |
| 21 | 37346120881 |
| 22 | 51656962081 |
| 23 | 78310705441 |
| 24 | 102337070401 |
[1,241,6481,61681,390001,1561921,5762401,15790321, 42521761,93990241,214344241,399754561,815702161, 1388738641,2527596481,4042322161,6975673921, 10247744401,16983432721,24055651681,37346120881, 51656962081,78310705441,102337070401] |