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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 33 |
| 4 | 200 |
| 5 | 1361 |
| 6 | 8844 |
| 7 | 58513 |
| 8 | 384400 |
| 9 | 2532321 |
| 10 | 16664084 |
| 11 | 109705793 |
| 12 | 722112600 |
| 13 | 4753448881 |
| 14 | 31289709724 |
| 15 | 205967469873 |
| 16 | 1355794944800 |
| 17 | 8924626767041 |
| 18 | 58747021129764 |
| 19 | 386706739558753 |
| 20 | 2545526317441000 |
[1,4,33,200,1361,8844,58513,384400,2532321, 16664084,109705793,722112600,4753448881, 31289709724,205967469873,1355794944800, 8924626767041,58747021129764,386706739558753, 2545526317441000] |