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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 15 |
| 3 | 73 |
| 4 | 231 |
| 5 | 562 |
| 6 | 1155 |
| 7 | 2133 |
| 8 | 3632 |
| 9 | 5801 |
| 10 | 8830 |
| 11 | 12907 |
| 12 | 18264 |
| 13 | 25131 |
| 14 | 33766 |
| 15 | 44461 |
| 16 | 57524 |
| 17 | 73274 |
| 18 | 92043 |
| 19 | 114213 |
| 20 | 140173 |
| 21 | 170289 |
| 22 | 205057 |
| 23 | 244884 |
| 24 | 290251 |
| 25 | 341658 |
| 26 | 399594 |
| 27 | 464582 |
| 28 | 537200 |
| 29 | 618046 |
| 30 | 707665 |
| 31 | 806727 |
| 32 | 915828 |
| 33 | 1035607 |
[0,1,15,73,231,562,1155,2133,3632,5801,8830,12907, 18264,25131,33766,44461,57524,73274,92043,114213, 140173,170289,205057,244884,290251,341658,399594, 464582,537200,618046,707665,806727,915828,1035607] |