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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 15 |
| 3 | 52 |
| 4 | 125 |
| 5 | 306 |
| 6 | 555 |
| 7 | 992 |
| 8 | 1673 |
| 9 | 2606 |
| 10 | 3663 |
| 11 | 5024 |
| 12 | 6777 |
| 13 | 8914 |
| 14 | 11379 |
| 15 | 14264 |
| 16 | 17729 |
| 17 | 21738 |
| 18 | 26191 |
| 19 | 31204 |
| 20 | 36933 |
| 21 | 43322 |
| 22 | 50243 |
| 23 | 57892 |
| 24 | 66645 |
| 25 | 76034 |
| 26 | 86163 |
| 27 | 97156 |
| 28 | 109293 |
| 29 | 122350 |
| 30 | 136083 |
| 31 | 150744 |
| 32 | 166801 |
| 33 | 183978 |
| 34 | 202119 |
| 35 | 221164 |
| 36 | 241881 |
| 37 | 263758 |
[2,15,52,125,306,555,992,1673,2606,3663,5024,6777, 8914,11379,14264,17729,21738,26191,31204,36933, 43322,50243,57892,66645,76034,86163,97156,109293, 122350,136083,150744,166801,183978,202119,221164, 241881,263758] |