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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 62 |
| 3 | 378 |
| 4 | 2758 |
| 5 | 21028 |
| 6 | 152410 |
| 7 | 1123856 |
| 8 | 8320912 |
| 9 | 61313142 |
| 10 | 452500906 |
| 11 | 3340771202 |
| 12 | 24653586076 |
| 13 | 181959666062 |
| 14 | 1343028411144 |
| 15 | 9912362521336 |
| 16 | 73160174987386 |
| 17 | 539975059887262 |
| 18 | 3985391431572110 |
| 19 | 29414994393633268 |
[6,62,378,2758,21028,152410,1123856,8320912, 61313142,452500906,3340771202,24653586076, 181959666062,1343028411144,9912362521336, 73160174987386,539975059887262,3985391431572110, 29414994393633268] |