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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 55 |
| 4 | 460 |
| 5 | 3876 |
| 6 | 33594 |
| 7 | 296010 |
| 8 | 2630044 |
| 9 | 23535820 |
| 10 | 211911256 |
| 11 | 1917334783 |
| 12 | 17417167156 |
| 13 | 158753389900 |
| 14 | 1451182694940 |
| 15 | 13298522298180 |
| 16 | 122131736900380 |
| 17 | 1123787895356412 |
| 18 | 10358022417860040 |
| 19 | 95615237915961100 |
| 20 | 883829035764950960 |
| 21 | 8179808679272664720 |
[1,1,6,55,460,3876,33594,296010,2630044,23535820, 211911256,1917334783,17417167156,158753389900, 1451182694940,13298522298180,122131736900380, 1123787895356412,10358022417860040, 95615237915961100,883829035764950960, 8179808679272664720] |