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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 30 |
| 3 | 323 |
| 4 | 3110 |
| 5 | 27777 |
| 6 | 237498 |
| 7 | 1977439 |
| 8 | 16202990 |
| 9 | 131490509 |
| 10 | 1060894002 |
| 11 | 8529819531 |
| 12 | 68439823942 |
| 13 | 548461371993 |
| 14 | 4392080943978 |
| 15 | 35156984457463 |
| 16 | 281349668446430 |
| 17 | 2251228221924645 |
| 18 | 18011798305060578 |
| 19 | 144103388698943651 |
| 20 | 1152868080218482102 |
| 21 | 9223130638279472433 |
[1,30,323,3110,27777,237498,1977439,16202990, 131490509,1060894002,8529819531,68439823942, 548461371993,4392080943978,35156984457463, 281349668446430,2251228221924645, 18011798305060578,144103388698943651, 1152868080218482102,9223130638279472433] |