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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 126 |
| 3 | 7336 |
| 4 | 665120 |
| 5 | 80038860 |
| 6 | 11992785628 |
| 7 | 2148752458832 |
| 8 | 448000621008112 |
| 9 | 106551292402319492 |
| 10 | 28471977293653977714 |
| 11 | 8445425847422222518488 |
| 12 | 2753705028193531309816184 |
| 13 | 978990839708922602845440908 |
| 14 | 376905974468378563863272876248 |
| 15 | 156221832236610857130449469228920 |
| 16 | 69360325968752963320307268181976608 |
[4,126,7336,665120,80038860,11992785628, 2148752458832,448000621008112,106551292402319492, 28471977293653977714,8445425847422222518488, 2753705028193531309816184, 978990839708922602845440908, 376905974468378563863272876248, 156221832236610857130449469228920, 69360325968752963320307268181976608] |