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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 16 |
| 3 | 108 |
| 4 | 900 |
| 5 | 6300 |
| 6 | 50176 |
| 7 | 352800 |
| 8 | 2722500 |
| 9 | 19111950 |
| 10 | 144288144 |
| 11 | 1010017008 |
| 12 | 7505103424 |
| 13 | 52382558592 |
| 14 | 384598425600 |
| 15 | 2677165603200 |
| 16 | 19473033306276 |
| 17 | 135229397960250 |
| 18 | 976281270250000 |
| 19 | 6765629202832500 |
| 20 | 48545357372612100 |
[2,16,108,900,6300,50176,352800,2722500,19111950, 144288144,1010017008,7505103424,52382558592, 384598425600,2677165603200,19473033306276, 135229397960250,976281270250000,6765629202832500, 48545357372612100] |