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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 | 4 |
| 3 | 30 |
| 4 | 312 |
| 5 | 3965 |
| 6 | 57824 |
| 7 | 933998 |
| 8 | 16346728 |
| 9 | 305539046 |
| 10 | 6037780164 |
| 11 | 125227212342 |
| 12 | 2711254371568 |
| 13 | 61021656441091 |
| 14 | 1423063422363676 |
| 15 | 34297379607790288 |
| 16 | 852463916004336464 |
| 17 | 21812807282389353798 |
[1,1,4,30,312,3965,57824,933998,16346728, 305539046,6037780164,125227212342,2711254371568, 61021656441091,1423063422363676,34297379607790288, 852463916004336464,21812807282389353798] |