The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 10 | 0 |
| 11 | 1 |
| 12 | 515 |
| 13 | 22253 |
| 14 | 430909 |
| 15 | 6094476 |
| 16 | 74507486 |
| 17 | 847129333 |
| 18 | 9296465127 |
| 19 | 100540964675 |
| 20 | 1085004090887 |
| 21 | 11775039127122 |
| 22 | 129155075413877 |
| 23 | 1436488582202316 |
| 24 | 16235344928131625 |
| 25 | 186710546094489052 |
| 26 | 2186538096666720967 |
| 27 | 26085011069325363939 |
| 28 | 317049671003606985326 |
[0,1,515,22253,430909,6094476,74507486,847129333, 9296465127,100540964675,1085004090887, 11775039127122,129155075413877,1436488582202316, 16235344928131625,186710546094489052, 2186538096666720967,26085011069325363939, 317049671003606985326] |