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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 9 |
| 4 | 68 |
| 5 | 215 |
| 6 | 504 |
| 7 | 1001 |
| 8 | 1784 |
| 9 | 2943 |
| 10 | 4580 |
| 11 | 6809 |
| 12 | 9756 |
| 13 | 13559 |
| 14 | 18368 |
| 15 | 24345 |
| 16 | 31664 |
| 17 | 40511 |
| 18 | 51084 |
| 19 | 63593 |
| 20 | 78260 |
| 21 | 95319 |
| 22 | 115016 |
| 23 | 137609 |
| 24 | 163368 |
| 25 | 192575 |
| 26 | 225524 |
| 27 | 262521 |
| 28 | 303884 |
| 29 | 349943 |
| 30 | 401040 |
| 31 | 457529 |
| 32 | 519776 |
| 33 | 588159 |
| 34 | 663068 |
| 35 | 744905 |
| 36 | 834084 |
| 37 | 931031 |
| 38 | 1036184 |
[0,0,9,68,215,504,1001,1784,2943,4580,6809,9756, 13559,18368,24345,31664,40511,51084,63593,78260, 95319,115016,137609,163368,192575,225524,262521, 303884,349943,401040,457529,519776,588159,663068, 744905,834084,931031,1036184] |