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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 289 |
| 3 | 527 |
| 4 | 14294 |
| 5 | 333207 |
| 6 | 7760044 |
| 7 | 302924053 |
| 8 | 11244564485 |
| 9 | 374107033198 |
| 10 | 13676571568127 |
| 11 | 507556461460973 |
| 12 | 18202712275182220 |
| 13 | 661696234025152587 |
| 14 | 24271816590074405501 |
| 15 | 883498080212983561554 |
| 16 | 32182611394905747315615 |
[21,289,527,14294,333207,7760044,302924053, 11244564485,374107033198,13676571568127, 507556461460973,18202712275182220, 661696234025152587,24271816590074405501, 883498080212983561554,32182611394905747315615] |