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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 39 |
| 3 | 230 |
| 4 | 929 |
| 5 | 6307 |
| 6 | 52171 |
| 7 | 371130 |
| 8 | 2568565 |
| 9 | 18322421 |
| 10 | 129531126 |
| 11 | 926299920 |
| 12 | 6712699992 |
| 13 | 48087248218 |
| 14 | 341400959047 |
| 15 | 2440466698929 |
| 16 | 17538694281014 |
| 17 | 125725413376414 |
| 18 | 899035671334963 |
| 19 | 6432936252126858 |
| 20 | 46077832832481217 |
[1,39,230,929,6307,52171,371130,2568565,18322421, 129531126,926299920,6712699992,48087248218, 341400959047,2440466698929,17538694281014, 125725413376414,899035671334963,6432936252126858, 46077832832481217] |