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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 336 |
| 3 | 5767 |
| 4 | 110455 |
| 5 | 2179956 |
| 6 | 41299256 |
| 7 | 725674326 |
| 8 | 11698232451 |
| 9 | 172994405326 |
| 10 | 2356249442222 |
| 11 | 29713542257399 |
| 12 | 348752692539813 |
| 13 | 3828597575581476 |
| 14 | 39486426123589674 |
| 15 | 384123325152744838 |
| 16 | 3537191225894230125 |
[21,336,5767,110455,2179956,41299256,725674326, 11698232451,172994405326,2356249442222, 29713542257399,348752692539813,3828597575581476, 39486426123589674,384123325152744838, 3537191225894230125] |