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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 49 |
| 3 | 574 |
| 4 | 3170 |
| 5 | 12373 |
| 6 | 39110 |
| 7 | 106825 |
| 8 | 261632 |
| 9 | 588256 |
| 10 | 1233991 |
| 11 | 2443430 |
| 12 | 4607306 |
[0,49,574,3170,12373,39110,106825,261632,588256, 1233991,2443430,4607306] |