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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 175 |
| 3 | 1630 |
| 4 | 13921 |
| 5 | 112756 |
| 6 | 881875 |
| 7 | 6730810 |
| 8 | 50468341 |
| 9 | 373414096 |
| 10 | 2734771975 |
| 11 | 19868820790 |
| 12 | 143434778761 |
| 13 | 1030163245036 |
| 14 | 7367866260475 |
| 15 | 52515419443570 |
| 16 | 373250112873181 |
| 17 | 2646603979861576 |
| 18 | 18729347384947375 |
| 19 | 132324150012391150 |
| 20 | 933581363480079601 |
[1,16,175,1630,13921,112756,881875,6730810, 50468341,373414096,2734771975,19868820790, 143434778761,1030163245036,7367866260475, 52515419443570,373250112873181,2646603979861576, 18729347384947375,132324150012391150, 933581363480079601] |