| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 4 |
| 4 | 13 |
| 5 | 37 |
| 6 | 75 |
| 7 | 147 |
| 8 | 246 |
| 9 | 406 |
| 10 | 610 |
| 11 | 910 |
| 12 | 1275 |
| 13 | 1779 |
| 14 | 2373 |
| 15 | 3157 |
| 16 | 4060 |
| 17 | 5212 |
| 18 | 6516 |
| 19 | 8136 |
| 20 | 9945 |
| 21 | 12145 |
| 22 | 14575 |
| 23 | 17479 |
| 24 | 20658 |
| 25 | 24402 |
| 26 | 28470 |
| 27 | 33202 |
| 28 | 38311 |
| 29 | 44191 |
| 30 | 50505 |
| 31 | 57705 |
| 32 | 65400 |
| 33 | 74104 |
| 34 | 83368 |
| 35 | 93772 |
| 36 | 104805 |
| 37 | 117117 |
| 38 | 130131 |
| 39 | 144571 |
| 40 | 159790 |
| 41 | 176590 |
| 42 | 194250 |
| 43 | 213654 |
[0,0,4,13,37,75,147,246,406,610,910,1275,1779, 2373,3157,4060,5212,6516,8136,9945,12145,14575, 17479,20658,24402,28470,33202,38311,44191,50505, 57705,65400,74104,83368,93772,104805,117117, 130131,144571,159790,176590,194250,213654] |