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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 14 |
| 2 | 84 |
| 3 | 584 |
| 4 | 4368 |
| 5 | 33824 |
| 6 | 266304 |
| 7 | 2113664 |
| 8 | 16843008 |
| 9 | 134480384 |
| 10 | 1074791424 |
| 11 | 8594130944 |
| 12 | 68736258048 |
| 13 | 549822930944 |
| 14 | 4398314962944 |
| 15 | 35185445863424 |
| 16 | 281479271743488 |
| 17 | 2251816993685504 |
| 18 | 18014467229220864 |
| 19 | 144115462954287104 |
[3,14,84,584,4368,33824,266304,2113664,16843008, 134480384,1074791424,8594130944,68736258048, 549822930944,4398314962944,35185445863424, 281479271743488,2251816993685504, 18014467229220864,144115462954287104] |