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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 0 |
| 5 | 6 |
| 6 | 0 |
| 7 | 0 |
| 8 | 39 |
| 9 | 30 |
| 10 | 45 |
| 11 | 363 |
| 12 | 612 |
| 13 | 1041 |
| 14 | 4071 |
| 15 | 9711 |
| 16 | 20430 |
| 17 | 59787 |
| 18 | 159786 |
| 19 | 383781 |
| 20 | 1021164 |
| 21 | 2752449 |
| 22 | 7053003 |
| 23 | 18541263 |
| 24 | 49793187 |
| 25 | 131441724 |
| 26 | 348186552 |
| 27 | 934113951 |
| 28 | 2498081733 |
| 29 | 6679327998 |
| 30 | 17970661326 |
| 31 | 48405846876 |
[0,0,6,0,0,39,30,45,363,612,1041,4071,9711,20430, 59787,159786,383781,1021164,2752449,7053003, 18541263,49793187,131441724,348186552,934113951, 2498081733,6679327998,17970661326,48405846876] |