The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 13 |
| 6 | 0 |
| 7 | 0 |
| 8 | 141 |
| 9 | 141 |
| 10 | 0 |
| 11 | 0 |
| 12 | 1570 |
| 13 | 6153 |
| 14 | 1570 |
| 15 | 0 |
| 16 | 0 |
| 17 | 16336 |
| 18 | 275487 |
| 19 | 275487 |
| 20 | 16336 |
| 21 | 0 |
| 22 | 0 |
| 23 | 168102 |
| 24 | 11620928 |
| 25 | 50444759 |
| 26 | 11620928 |
| 27 | 168102 |
| 28 | 0 |
| 29 | 0 |
| 30 | 1719791 |
| 31 | 486820079 |
| 32 | 8577221762 |
| 33 | 8577221762 |
| 34 | 486820079 |
| 35 | 1719791 |
| 36 | 0 |
| 37 | 0 |
| 38 | 17563383 |
| 39 | 20299745484 |
[0,0,0,0,13,0,0,141,141,0,0,1570,6153,1570,0,0, 16336,275487,275487,16336,0,0,168102,11620928, 50444759,11620928,168102,0,0,1719791,486820079, 8577221762,8577221762,486820079,1719791,0,0, 17563383,20299745484] |