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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 400 |
| 3 | 2340 |
| 4 | 8910 |
| 5 | 26676 |
| 6 | 68060 |
| 7 | 154580 |
| 8 | 321110 |
| 9 | 621300 |
| 10 | 1134296 |
| 11 | 1972900 |
| 12 | 3293310 |
| 13 | 5306580 |
| 14 | 8291940 |
| 15 | 12612116 |
| 16 | 18730790 |
| 17 | 27232340 |
| 18 | 38844000 |
| 19 | 54460580 |
| 20 | 75171886 |
| 21 | 102292980 |
| 22 | 137397420 |
| 23 | 182353620 |
| 24 | 239364470 |
| 25 | 311010356 |
| 26 | 400295720 |
[20,400,2340,8910,26676,68060,154580,321110, 621300,1134296,1972900,3293310,5306580,8291940, 12612116,18730790,27232340,38844000,54460580, 75171886,102292980,137397420,182353620,239364470, 311010356,400295720] |