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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 49 |
| 3 | 392 |
| 4 | 5041 |
| 5 | 51842 |
| 6 | 591361 |
| 7 | 6422528 |
| 8 | 71385601 |
| 9 | 784792962 |
| 10 | 8672638129 |
| 11 | 95605150088 |
| 12 | 1055154220849 |
| 13 | 11638893993218 |
| 14 | 128416422417409 |
| 15 | 1416693454733312 |
| 16 | 15629912636083201 |
| 17 | 172434918695682818 |
| 18 | 1902390033466290481 |
| 19 | 20988007893796680072 |
| 20 | 231549660454953439921 |
[1,2,49,392,5041,51842,591361,6422528,71385601, 784792962,8672638129,95605150088,1055154220849, 11638893993218,128416422417409,1416693454733312, 15629912636083201,172434918695682818, 1902390033466290481,20988007893796680072, 231549660454953439921] |