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| n | a(n) |
|---|---|
| 1 | 550 |
| 2 | 1956 |
| 3 | 6879 |
| 4 | 26724 |
| 5 | 105206 |
| 6 | 437291 |
| 7 | 1848980 |
| 8 | 8110850 |
| 9 | 36063603 |
| 10 | 164600818 |
| 11 | 757902648 |
| 12 | 3556599303 |
| 13 | 16776665346 |
| 14 | 80262973548 |
| 15 | 385100839073 |
| 16 | 1867833712028 |
| 17 | 9073256041802 |
| 18 | 44449997869523 |
| 19 | 217924654516054 |
| 20 | 1075628687033984 |
[550,1956,6879,26724,105206,437291,1848980, 8110850,36063603,164600818,757902648,3556599303, 16776665346,80262973548,385100839073, 1867833712028,9073256041802,44449997869523, 217924654516054,1075628687033984] |