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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 | 4 |
| 2 | 28 |
| 3 | 240 |
| 4 | 2316 |
| 5 | 24240 |
| 6 | 269392 |
| 7 | 3135808 |
| 8 | 37869676 |
| 9 | 471189680 |
| 10 | 6008850512 |
| 11 | 78221787968 |
| 12 | 1036166807056 |
| 13 | 13931585235520 |
| 14 | 189737945839552 |
| 15 | 2613162137898752 |
| 16 | 36344513366001452 |
| 17 | 509885938301354672 |
| 18 | 7208577711881000912 |
[1,4,28,240,2316,24240,269392,3135808,37869676, 471189680,6008850512,78221787968,1036166807056, 13931585235520,189737945839552,2613162137898752, 36344513366001452,509885938301354672, 7208577711881000912] |