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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 | 20 |
| 2 | 220 |
| 3 | 2330 |
| 4 | 24640 |
| 5 | 261050 |
| 6 | 2771560 |
| 7 | 29487170 |
| 8 | 314358880 |
| 9 | 3357947690 |
| 10 | 35937424600 |
| 11 | 385311670610 |
| 12 | 4138428376720 |
| 13 | 44522712143930 |
| 14 | 479749833583240 |
| 15 | 5177248169415650 |
| 16 | 55949729863572160 |
| 17 | 605447028499293770 |
[1,20,220,2330,24640,261050,2771560,29487170, 314358880,3357947690,35937424600,385311670610, 4138428376720,44522712143930,479749833583240, 5177248169415650,55949729863572160, 605447028499293770] |