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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 | 0 |
| 2 | 0 |
| 3 | 5461 |
| 4 | 81485 |
| 5 | 822719 |
| 6 | 5981171 |
| 7 | 35644936 |
| 8 | 182099840 |
| 9 | 827892416 |
| 10 | 3421494778 |
| 11 | 13071040971 |
| 12 | 46705593456 |
| 13 | 157565735017 |
| 14 | 505495512327 |
| 15 | 1551275741849 |
| 16 | 4575618361577 |
| 17 | 13023672238682 |
| 18 | 35891688317656 |
| 19 | 96044494715093 |
| 20 | 250169937122941 |
| 21 | 635634787400407 |
[1,0,0,5461,81485,822719,5981171,35644936, 182099840,827892416,3421494778,13071040971, 46705593456,157565735017,505495512327, 1551275741849,4575618361577,13023672238682, 35891688317656,96044494715093,250169937122941, 635634787400407] |