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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 9 |
| 7 | 20 |
| 8 | 36 |
| 9 | 62 |
| 10 | 99 |
| 11 | 136 |
| 12 | 203 |
| 13 | 264 |
| 14 | 349 |
| 15 | 455 |
| 16 | 574 |
| 17 | 709 |
| 18 | 866 |
| 19 | 1035 |
| 20 | 1249 |
| 21 | 1470 |
| 22 | 1707 |
| 23 | 1979 |
| 24 | 2302 |
| 25 | 2636 |
| 26 | 2983 |
| 27 | 3386 |
| 28 | 3826 |
| 29 | 4277 |
| 30 | 4789 |
| 31 | 5325 |
| 32 | 5903 |
| 33 | 6472 |
| 34 | 7166 |
| 35 | 7879 |
| 36 | 8620 |
| 37 | 9383 |
| 38 | 10232 |
| 39 | 11074 |
| 40 | 12070 |
| 41 | 13027 |
| 42 | 14071 |
| 43 | 15151 |
| 44 | 16285 |
| 45 | 17510 |
| 46 | 18731 |
| 47 | 20039 |
| 48 | 21449 |
| 49 | 22889 |
| 50 | 24391 |
[0,0,0,0,1,9,20,36,62,99,136,203,264,349,455,574, 709,866,1035,1249,1470,1707,1979,2302,2636,2983, 3386,3826,4277,4789,5325,5903,6472,7166,7879,8620, 9383,10232,11074,12070,13027,14071,15151,16285, 17510,18731,20039,21449,22889,24391] |