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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 20 |
| 3 | 386 |
| 4 | 11252 |
| 5 | 441722 |
| 6 | 21867764 |
| 7 | 1308580226 |
| 8 | 91904288420 |
| 9 | 7413237414602 |
| 10 | 675503178005108 |
| 11 | 68631619821747842 |
| 12 | 7693344955213551428 |
| 13 | 943236099444038389082 |
| 14 | 125565496331888560573172 |
| 15 | 18037220418654308659836674 |
| 16 | 2780985275750966018759898212 |
| 17 | 458079154394191702424821932842 |
[1,2,20,386,11252,441722,21867764,1308580226, 91904288420,7413237414602,675503178005108, 68631619821747842,7693344955213551428, 943236099444038389082,125565496331888560573172, 18037220418654308659836674, 2780985275750966018759898212, 458079154394191702424821932842] |