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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 | 18 |
| 4 | 156 |
| 5 | 1020 |
| 6 | 23040 |
| 7 | 189000 |
| 8 | 8462160 |
| 9 | 174741840 |
| 10 | 8418513600 |
| 11 | 110288455200 |
| 12 | 26670240273600 |
| 13 | 364684824504000 |
| 14 | 46300470369753600 |
| 15 | 5169242034644688000 |
| 16 | 359472799348030368000 |
| 17 | 7508907247291081632000 |
| 18 | 6157317530690533823616000 |
[1,1,4,18,156,1020,23040,189000,8462160,174741840, 8418513600,110288455200,26670240273600, 364684824504000,46300470369753600, 5169242034644688000,359472799348030368000, 7508907247291081632000,6157317530690533823616000] |