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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 17 |
| 3 | 47 |
| 4 | 179 |
| 5 | 414 |
| 6 | 1723 |
| 7 | 3793 |
| 8 | 16201 |
| 9 | 35166 |
| 10 | 151337 |
| 11 | 327167 |
| 12 | 1411019 |
| 13 | 3046854 |
| 14 | 13148803 |
| 15 | 28383073 |
| 16 | 122510161 |
| 17 | 264425526 |
| 18 | 1141401857 |
| 19 | 2463529487 |
| 20 | 10634068259 |
| 21 | 22951715694 |
| 22 | 99073772683 |
| 23 | 213832351153 |
| 24 | 923033565721 |
[1,6,17,47,179,414,1723,3793,16201,35166,151337, 327167,1411019,3046854,13148803,28383073, 122510161,264425526,1141401857,2463529487, 10634068259,22951715694,99073772683,213832351153, 923033565721] |