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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 6 |
| 4 | 234 |
| 5 | 2817 |
| 6 | 19362 |
| 7 | 94584 |
| 8 | 365904 |
| 9 | 1193283 |
| 10 | 3413619 |
| 11 | 8800704 |
| 12 | 20845968 |
| 13 | 46017972 |
| 14 | 95710797 |
| 15 | 189154056 |
| 16 | 357631176 |
| 17 | 650438802 |
| 18 | 1143119610 |
| 19 | 1948614426 |
| 20 | 3232108278 |
| 21 | 5230489803 |
| 22 | 8277505236 |
| 23 | 12835867968 |
| 24 | 19537783320 |
| 25 | 29235566685 |
[0,0,6,234,2817,19362,94584,365904,1193283, 3413619,8800704,20845968,46017972,95710797, 189154056,357631176,650438802,1143119610, 1948614426,3232108278,5230489803,8277505236, 12835867968,19537783320,29235566685] |