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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 14 |
| 3 | 168 |
| 4 | 2356 |
| 5 | 37832 |
| 6 | 701464 |
| 7 | 14866848 |
| 8 | 352943376 |
| 9 | 9219925792 |
| 10 | 261954304224 |
| 11 | 8033968939648 |
| 12 | 264411579439936 |
| 13 | 9288709762556032 |
| 14 | 346608927301622144 |
| 15 | 13680000261825018368 |
| 16 | 569006722158124974336 |
| 17 | 24864267879086770135552 |
| 18 | 1138321277772163220033024 |
[1,2,14,168,2356,37832,701464,14866848,352943376, 9219925792,261954304224,8033968939648, 264411579439936,9288709762556032, 346608927301622144,13680000261825018368, 569006722158124974336,24864267879086770135552, 1138321277772163220033024] |