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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 7 |
| 5 | 0 |
| 6 | 32 |
| 7 | 0 |
| 8 | 168 |
| 9 | 0 |
| 10 | 948 |
| 11 | 0 |
| 12 | 5279 |
| 13 | 0 |
| 14 | 29868 |
| 15 | 0 |
| 16 | 170435 |
| 17 | 0 |
| 18 | 978324 |
| 19 | 0 |
| 20 | 5646204 |
| 21 | 0 |
| 22 | 32726780 |
| 23 | 0 |
| 24 | 190380464 |
| 25 | 0 |
| 26 | 1110922620 |
| 27 | 0 |
| 28 | 6499777527 |
| 29 | 0 |
| 30 | 38116781580 |
| 31 | 0 |
| 32 | 223982494824 |
| 33 | 0 |
| 34 | 1318530693372 |
| 35 | 0 |
| 36 | 7774269747257 |
| 37 | 0 |
| 38 | 45903969026388 |
| 39 | 0 |
[0,0,0,7,0,32,0,168,0,948,0,5279,0,29868,0,170435, 0,978324,0,5646204,0,32726780,0,190380464,0, 1110922620,0,6499777527,0,38116781580,0, 223982494824,0,1318530693372,0,7774269747257,0, 45903969026388,0] |