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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 53 |
| 5 | 887 |
| 6 | 32679 |
| 7 | 2747187 |
| 8 | 508394434 |
| 9 | 214213272638 |
| 10 | 198419328607654 |
| 11 | 418226185357910272 |
| 12 | 1937353825293000128681 |
| 13 | 20419649837290401081275737 |
| 14 | 472970434622490946099542458239 |
| 15 | 24925951955494891233466080771797644 |
[1,1,2,7,53,887,32679,2747187,508394434, 214213272638,198419328607654,418226185357910272, 1937353825293000128681,20419649837290401081275737, 472970434622490946099542458239, 24925951955494891233466080771797644] |