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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 12 |
| 3 | 57 |
| 4 | 185 |
| 5 | 459 |
| 6 | 974 |
| 7 | 1830 |
| 8 | 3168 |
| 9 | 5158 |
| 10 | 7957 |
| 11 | 11766 |
| 12 | 16830 |
| 13 | 23378 |
| 14 | 31689 |
| 15 | 42041 |
| 16 | 54774 |
| 17 | 70218 |
| 18 | 88757 |
| 19 | 110720 |
| 20 | 136558 |
| 21 | 166715 |
| 22 | 201620 |
| 23 | 241761 |
| 24 | 287646 |
| 25 | 339854 |
| 26 | 398829 |
| 27 | 465198 |
| 28 | 539557 |
| 29 | 622513 |
| 30 | 714762 |
| 31 | 816892 |
| 32 | 929637 |
| 33 | 1053742 |
[0,1,12,57,185,459,974,1830,3168,5158,7957,11766, 16830,23378,31689,42041,54774,70218,88757,110720, 136558,166715,201620,241761,287646,339854,398829, 465198,539557,622513,714762,816892,929637,1053742] |