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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 | 0 |
| 4 | 1 |
| 5 | 8 |
| 6 | 42 |
| 7 | 266 |
| 8 | 1927 |
| 9 | 15844 |
| 10 | 146122 |
| 11 | 1493700 |
| 12 | 16762639 |
| 13 | 204876708 |
| 14 | 2708925368 |
| 15 | 38526938568 |
| 16 | 586465620430 |
| 17 | 9513775620309 |
| 18 | 163848357905335 |
| 19 | 2985681188497227 |
| 20 | 57391427290002261 |
| 21 | 1160582196308934615 |
[1,0,0,0,1,8,42,266,1927,15844,146122,1493700, 16762639,204876708,2708925368,38526938568, 586465620430,9513775620309,163848357905335, 2985681188497227,57391427290002261, 1160582196308934615] |