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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 83 |
| 3 | 494 |
| 4 | 3067 |
| 5 | 17962 |
| 6 | 86488 |
| 7 | 320270 |
| 8 | 917811 |
| 9 | 2127013 |
| 10 | 4211511 |
| 11 | 7437417 |
| 12 | 12070971 |
| 13 | 18378413 |
| 14 | 26625983 |
| 15 | 37079921 |
| 16 | 50006467 |
| 17 | 65671861 |
| 18 | 84342343 |
| 19 | 106284153 |
| 20 | 131763531 |
| 21 | 161046717 |
| 22 | 194399951 |
| 23 | 232089473 |
| 24 | 274381523 |
| 25 | 321542341 |
[15,83,494,3067,17962,86488,320270,917811,2127013, 4211511,7437417,12070971,18378413,26625983, 37079921,50006467,65671861,84342343,106284153, 131763531,161046717,194399951,232089473,274381523, 321542341] |