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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 3 |
| 5 | 3 |
| 6 | 0 |
| 7 | 74 |
| 8 | 10482 |
| 9 | 303268 |
| 10 | 3440700 |
| 11 | 19842840 |
| 12 | 65867760 |
| 13 | 133580160 |
| 14 | 168399000 |
| 15 | 128898000 |
| 16 | 54885600 |
| 17 | 9979200 |
| 18 | 0 |
| 19 | 40927 |
| 20 | 731157018 |
| 21 | 729348051686 |
| 22 | 151526009158620 |
| 23 | 11418355290999750 |
| 24 | 415756294427389020 |
| 25 | 8643340000393019040 |
[0,0,0,3,3,0,74,10482,303268,3440700,19842840, 65867760,133580160,168399000,128898000,54885600, 9979200,0,40927,731157018,729348051686, 151526009158620,11418355290999750, 415756294427389020,8643340000393019040] |