The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 26 |
| 2 | 475 |
| 3 | 7520 |
| 4 | 110341 |
| 5 | 1545446 |
| 6 | 20980975 |
| 7 | 278565740 |
| 8 | 3637529881 |
| 9 | 46892529266 |
| 10 | 598374287875 |
| 11 | 7572794935160 |
| 12 | 95188878040621 |
| 13 | 1189735265087486 |
| 14 | 14798979200433175 |
| 15 | 183331466632763780 |
[1,26,475,7520,110341,1545446,20980975,278565740, 3637529881,46892529266,598374287875,7572794935160, 95188878040621,1189735265087486,14798979200433175, 183331466632763780] |