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| n | a(n) |
|---|---|
| 1 | 64 |
| 2 | 301 |
| 3 | 137 |
| 4 | 952 |
| 5 | 4924 |
| 6 | 19269 |
| 7 | 116051 |
| 8 | 642696 |
| 9 | 3313121 |
| 10 | 19431636 |
| 11 | 109795406 |
| 12 | 592849148 |
| 13 | 3399315271 |
| 14 | 19264726916 |
| 15 | 105918199897 |
| 16 | 600490288656 |
| 17 | 3398611439536 |
| 18 | 18863937917408 |
| 19 | 106352314369227 |
| 20 | 600681055187239 |
[64,301,137,952,4924,19269,116051,642696,3313121, 19431636,109795406,592849148,3399315271, 19264726916,105918199897,600490288656, 3398611439536,18863937917408,106352314369227, 600681055187239] |