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| n | a(n) |
|---|---|
| 1 | 43 |
| 2 | 174 |
| 3 | 689 |
| 4 | 2804 |
| 5 | 11324 |
| 6 | 46003 |
| 7 | 186672 |
| 8 | 758077 |
| 9 | 3077859 |
| 10 | 12497826 |
| 11 | 50746523 |
| 12 | 206054545 |
| 13 | 836678679 |
| 14 | 3397305868 |
| 15 | 13794653865 |
| 16 | 56012764479 |
| 17 | 227438082864 |
| 18 | 923505221937 |
| 19 | 3749864236851 |
| 20 | 15226206788800 |
| 21 | 61825538083188 |
[43,174,689,2804,11324,46003,186672,758077, 3077859,12497826,50746523,206054545,836678679, 3397305868,13794653865,56012764479,227438082864, 923505221937,3749864236851,15226206788800, 61825538083188] |