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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 11 |
| 4 | 56 |
| 5 | 177 |
| 6 | 500 |
| 7 | 1175 |
| 8 | 2540 |
| 9 | 4995 |
| 10 | 9246 |
| 11 | 16111 |
| 12 | 26888 |
| 13 | 43013 |
| 14 | 66664 |
| 15 | 100213 |
| 16 | 146984 |
| 17 | 210543 |
| 18 | 295740 |
| 19 | 407755 |
| 20 | 553372 |
| 21 | 739887 |
| 22 | 976396 |
| 23 | 1272691 |
| 24 | 1640772 |
| 25 | 2093315 |
[2,11,56,177,500,1175,2540,4995,9246,16111,26888, 43013,66664,100213,146984,210543,295740,407755, 553372,739887,976396,1272691,1640772,2093315] |