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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 11 |
| 3 | 50 |
| 4 | 150 |
| 5 | 355 |
| 6 | 721 |
| 7 | 1316 |
| 8 | 2220 |
| 9 | 3525 |
| 10 | 5335 |
| 11 | 7766 |
| 12 | 10946 |
| 13 | 15015 |
| 14 | 20125 |
| 15 | 26440 |
| 16 | 34136 |
| 17 | 43401 |
| 18 | 54435 |
| 19 | 67450 |
| 20 | 82670 |
| 21 | 100331 |
| 22 | 120681 |
| 23 | 143980 |
| 24 | 170500 |
| 25 | 200525 |
| 26 | 234351 |
| 27 | 272286 |
| 28 | 314650 |
| 29 | 361775 |
| 30 | 414005 |
| 31 | 471696 |
| 32 | 535216 |
| 33 | 604945 |
| 34 | 681275 |
[0,1,11,50,150,355,721,1316,2220,3525,5335,7766, 10946,15015,20125,26440,34136,43401,54435,67450, 82670,100331,120681,143980,170500,200525,234351, 272286,314650,361775,414005,471696,535216,604945, 681275] |