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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 6 |
| 2 | 15 |
| 3 | 34 |
| 4 | 85 |
| 5 | 236 |
| 6 | 695 |
| 7 | 2094 |
| 8 | 6345 |
| 9 | 19216 |
| 10 | 58075 |
| 11 | 175154 |
| 12 | 527405 |
| 13 | 1586196 |
| 14 | 4766655 |
| 15 | 14316214 |
| 16 | 42981265 |
| 17 | 129009176 |
| 18 | 387158435 |
| 19 | 1161737274 |
| 20 | 3485735925 |
| 21 | 10458256156 |
| 22 | 31376865415 |
| 23 | 94134790334 |
| 24 | 282412759385 |
| 25 | 847255055136 |
[0,6,15,34,85,236,695,2094,6345,19216,58075, 175154,527405,1586196,4766655,14316214,42981265, 129009176,387158435,1161737274,3485735925, 10458256156,31376865415,94134790334,282412759385, 847255055136] |