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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 21 |
| 2 | 883 |
| 3 | 18564 |
| 4 | 780571 |
| 5 | 16410555 |
| 6 | 690023881 |
| 7 | 14506912056 |
| 8 | 609980330233 |
| 9 | 12824093846949 |
| 10 | 539221921902091 |
| 11 | 11336484453790860 |
| 12 | 476671568981118211 |
| 13 | 10021439433057273291 |
| 14 | 421377127757386596433 |
| 15 | 8858941122338175798384 |
[1,21,883,18564,780571,16410555,690023881, 14506912056,609980330233,12824093846949, 539221921902091,11336484453790860, 476671568981118211,10021439433057273291, 421377127757386596433,8858941122338175798384] |