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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 | 2 |
| 2 | 8 |
| 3 | 24 |
| 4 | 80 |
| 5 | 224 |
| 6 | 704 |
| 7 | 1920 |
| 8 | 5632 |
| 9 | 15360 |
| 10 | 43008 |
| 11 | 114688 |
| 12 | 315392 |
| 13 | 827392 |
| 14 | 2211840 |
| 15 | 5767168 |
| 16 | 15138816 |
| 17 | 38928384 |
| 18 | 100925440 |
| 19 | 256901120 |
| 20 | 657457152 |
| 21 | 1660944384 |
| 22 | 4202692608 |
| 23 | 10527703040 |
| 24 | 26424115200 |
| 25 | 65699577856 |
| 26 | 163477192704 |
| 27 | 403995361280 |
| 28 | 998043025408 |
[1,2,8,24,80,224,704,1920,5632,15360,43008,114688, 315392,827392,2211840,5767168,15138816,38928384, 100925440,256901120,657457152,1660944384, 4202692608,10527703040,26424115200,65699577856, 163477192704,403995361280,998043025408] |