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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 16 |
| 3 | 158 |
| 4 | 1232 |
| 5 | 8358 |
| 6 | 51744 |
| 7 | 300300 |
| 8 | 1661088 |
| 9 | 8853702 |
| 10 | 45819488 |
| 11 | 231499268 |
| 12 | 1146562144 |
| 13 | 5584082140 |
| 14 | 26808586560 |
| 15 | 127118807640 |
| 16 | 596271746880 |
| 17 | 2770379517510 |
| 18 | 12763270285920 |
| 19 | 58358565060180 |
| 20 | 265032926077920 |
| 21 | 1196278125942900 |
[0,1,16,158,1232,8358,51744,300300,1661088, 8853702,45819488,231499268,1146562144,5584082140, 26808586560,127118807640,596271746880, 2770379517510,12763270285920,58358565060180, 265032926077920,1196278125942900] |