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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 42 |
| 4 | 390 |
| 5 | 4698 |
| 6 | 69174 |
| 7 | 1203498 |
| 8 | 24163110 |
| 9 | 549811962 |
| 10 | 13982486166 |
| 11 | 393026414922 |
| 12 | 12099527531910 |
| 13 | 404881353252378 |
| 14 | 14632253175107574 |
| 15 | 567974815524008298 |
| 16 | 23567351945550373350 |
| 17 | 1040985881615266375482 |
| 18 | 48767788927611416600406 |
| 19 | 2415210691383917131432842 |
[1,2,6,42,390,4698,69174,1203498,24163110, 549811962,13982486166,393026414922,12099527531910, 404881353252378,14632253175107574, 567974815524008298,23567351945550373350, 1040985881615266375482,48767788927611416600406, 2415210691383917131432842] |