The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1872 |
| 3 | 25857 |
| 4 | 121600 |
| 5 | 368145 |
| 6 | 873936 |
| 7 | 1776817 |
| 8 | 3244032 |
| 9 | 5472225 |
| 10 | 8687440 |
| 11 | 13145121 |
| 12 | 19130112 |
| 13 | 26956657 |
| 14 | 36968400 |
| 15 | 49538385 |
| 16 | 65069056 |
| 17 | 83992257 |
| 18 | 106769232 |
| 19 | 133890625 |
| 20 | 165876480 |
| 21 | 203276241 |
| 22 | 246668752 |
| 23 | 296662257 |
| 24 | 353894400 |
| 25 | 419032225 |
| 26 | 492772176 |
| 27 | 575840097 |
| 28 | 668991232 |
[0,1,1872,25857,121600,368145,873936,1776817, 3244032,5472225,8687440,13145121,19130112, 26956657,36968400,49538385,65069056,83992257, 106769232,133890625,165876480,203276241,246668752, 296662257,353894400,419032225,492772176,575840097, 668991232] |