The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 28 |
| 3 | 544 |
| 4 | 13012 |
| 5 | 295190 |
| 6 | 6715738 |
| 7 | 152540636 |
| 8 | 3464413662 |
| 9 | 78677378754 |
| 10 | 1786751336003 |
| 11 | 40576751391716 |
| 12 | 921488781267445 |
| 13 | 20926797071937044 |
| 14 | 475242697298621311 |
| 15 | 10792651081336090474 |
| 16 | 245098594252284069018 |
[0,28,544,13012,295190,6715738,152540636, 3464413662,78677378754,1786751336003, 40576751391716,921488781267445,20926797071937044, 475242697298621311,10792651081336090474, 245098594252284069018] |