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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 138 |
| 3 | 5292 |
| 4 | 142140 |
| 5 | 2947590 |
| 6 | 49858158 |
| 7 | 712832792 |
| 8 | 8832976488 |
| 9 | 96648771870 |
| 10 | 947399938870 |
| 11 | 8416542780492 |
| 12 | 68407265558268 |
| 13 | 512700872216442 |
| 14 | 3567168162771570 |
| 15 | 23172711963346320 |
| 16 | 141251698411654288 |
| 17 | 811481822951916942 |
| 18 | 4410812923746903558 |
| 19 | 22762369531189431140 |
[2,138,5292,142140,2947590,49858158,712832792, 8832976488,96648771870,947399938870,8416542780492, 68407265558268,512700872216442,3567168162771570, 23172711963346320,141251698411654288, 811481822951916942,4410812923746903558, 22762369531189431140] |