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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 26 |
| 4 | 375 |
| 5 | 6696 |
| 6 | 159837 |
| 7 | 4389226 |
| 8 | 144915350 |
| 9 | 5377002075 |
| 10 | 227624621051 |
| 11 | 10632808475596 |
| 12 | 550932945236121 |
| 13 | 31062550998284221 |
| 14 | 1907051034025848314 |
| 15 | 126052420069459211076 |
| 16 | 8956882232940915920404 |
| 17 | 679298518935625486287703 |
| 18 | 54868537321267493152151502 |
| 19 | 4696952405203792017289469056 |
[1,3,26,375,6696,159837,4389226,144915350, 5377002075,227624621051,10632808475596, 550932945236121,31062550998284221, 1907051034025848314,126052420069459211076, 8956882232940915920404,679298518935625486287703, 54868537321267493152151502, 4696952405203792017289469056] |