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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 17 |
| 3 | 244 |
| 4 | 3378 |
| 5 | 46785 |
| 6 | 652256 |
| 7 | 9156348 |
| 8 | 129320648 |
| 9 | 1835951015 |
| 10 | 26179257723 |
| 11 | 374690184757 |
| 12 | 5379908547086 |
| 13 | 77459905683802 |
| 14 | 1117955506225531 |
| 15 | 16169269942413750 |
| 16 | 234298085780246524 |
| 17 | 3400717317239096007 |
| 18 | 49433392409740652030 |
| 19 | 719538498483347997844 |
| 20 | 10486149676767529103732 |
[1,1,17,244,3378,46785,652256,9156348,129320648, 1835951015,26179257723,374690184757,5379908547086, 77459905683802,1117955506225531,16169269942413750, 234298085780246524,3400717317239096007, 49433392409740652030,719538498483347997844, 10486149676767529103732] |