The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 0 |
| 5 | 1 |
| 6 | 4 |
| 7 | 3 |
| 8 | 0 |
| 9 | 1 |
| 10 | 26 |
| 11 | 28 |
| 12 | 9 |
| 13 | 0 |
| 14 | 1 |
| 15 | 296 |
| 16 | 490 |
| 17 | 212 |
| 18 | 25 |
| 19 | 0 |
| 20 | 1 |
| 21 | 6064 |
| 22 | 15336 |
| 23 | 9600 |
| 24 | 1692 |
| 25 | 75 |
| 26 | 0 |
| 27 | 1 |
| 28 | 230896 |
[1,0,1,1,0,1,4,3,0,1,26,28,9,0,1,296,490,212,25,0, 1,6064,15336,9600,1692,75,0,1,230896] |