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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 22 |
| 3 | 174 |
| 4 | 1444 |
| 5 | 12323 |
| 6 | 107104 |
| 7 | 942952 |
| 8 | 8381596 |
| 9 | 75053100 |
| 10 | 676017962 |
| 11 | 6118171326 |
| 12 | 55591175956 |
| 13 | 506805088026 |
| 14 | 4633571685968 |
| 15 | 42468065811884 |
| 16 | 390071875757852 |
| 17 | 3589637747968964 |
| 18 | 33089300640166360 |
| 19 | 305476314574338648 |
| 20 | 2823932709938708824 |
| 21 | 26137341654281261347 |
[1,3,22,174,1444,12323,107104,942952,8381596, 75053100,676017962,6118171326,55591175956, 506805088026,4633571685968,42468065811884, 390071875757852,3589637747968964, 33089300640166360,305476314574338648, 2823932709938708824,26137341654281261347] |