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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 36 |
| 3 | 194 |
| 4 | 1281 |
| 5 | 9701 |
| 6 | 78735 |
| 7 | 665135 |
| 8 | 5762860 |
| 9 | 50851224 |
| 10 | 455062596 |
| 11 | 4118082970 |
| 12 | 37607992089 |
| 13 | 346065767407 |
| 14 | 3204942420924 |
| 15 | 29844572385359 |
| 16 | 279238346816393 |
| 17 | 2623557174778439 |
| 18 | 24739954338671300 |
| 19 | 234057667428388199 |
| 20 | 2220819603016308080 |
| 21 | 21127269487386615272 |
[1,8,36,194,1281,9701,78735,665135,5762860, 50851224,455062596,4118082970,37607992089, 346065767407,3204942420924,29844572385359, 279238346816393,2623557174778439, 24739954338671300,234057667428388199, 2220819603016308080,21127269487386615272] |