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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 | 81 |
| 2 | 3240 |
| 3 | 85320 |
| 4 | 1663740 |
| 5 | 25621596 |
| 6 | 324540216 |
| 7 | 3477216600 |
| 8 | 32164253550 |
| 9 | 260887834350 |
| 10 | 1878392407320 |
| 11 | 12124169174520 |
| 12 | 70724320184700 |
| 13 | 375382930211100 |
| 14 | 1823288518168200 |
| 15 | 8144022047817960 |
| 16 | 33594090947249085 |
| 17 | 128447994798305325 |
| 18 | 456703981505085600 |
[1,81,3240,85320,1663740,25621596,324540216, 3477216600,32164253550,260887834350,1878392407320, 12124169174520,70724320184700,375382930211100, 1823288518168200,8144022047817960, 33594090947249085,128447994798305325, 456703981505085600] |