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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 70 |
| 4 | 924 |
| 5 | 184756 |
| 6 | 2704156 |
| 7 | 601080390 |
| 8 | 9075135300 |
| 9 | 2104098963720 |
| 10 | 7648690600760440 |
| 11 | 118264581564861424 |
| 12 | 442512540276836779204 |
| 13 | 107507208733336176461620 |
| 14 | 1678910486211891090247320 |
| 15 | 410795449442059149332177040 |
[2,6,70,924,184756,2704156,601080390,9075135300, 2104098963720,7648690600760440,118264581564861424, 442512540276836779204,107507208733336176461620, 1678910486211891090247320, 410795449442059149332177040] |