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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 22 |
| 3 | 246 |
| 4 | 5428 |
| 5 | 237818 |
| 6 | 20729610 |
| 7 | 3601738548 |
| 8 | 1249159521262 |
| 9 | 865793424024974 |
| 10 | 1200356073563114252 |
| 11 | 3331551471246807302142 |
| 12 | 18523112376180844925948966 |
| 13 | 206425939461681776649215679048 |
| 14 | 4613382950875473008207859661034814 |
[4,22,246,5428,237818,20729610,3601738548, 1249159521262,865793424024974,1200356073563114252, 3331551471246807302142,18523112376180844925948966, 206425939461681776649215679048, 4613382950875473008207859661034814] |