The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 4 |
| 2 | 19 |
| 3 | 55 |
| 4 | 125 |
| 5 | 245 |
| 6 | 434 |
| 7 | 714 |
| 8 | 1110 |
| 9 | 1650 |
| 10 | 2365 |
| 11 | 3289 |
| 12 | 4459 |
| 13 | 5915 |
| 14 | 7700 |
| 15 | 9860 |
| 16 | 12444 |
| 17 | 15504 |
| 18 | 19095 |
| 19 | 23275 |
| 20 | 28105 |
| 21 | 33649 |
| 22 | 39974 |
| 23 | 47150 |
| 24 | 55250 |
| 25 | 64350 |
| 26 | 74529 |
| 27 | 85869 |
| 28 | 98455 |
| 29 | 112375 |
| 30 | 127720 |
| 31 | 144584 |
| 32 | 163064 |
| 33 | 183260 |
| 34 | 205275 |
| 35 | 229215 |
| 36 | 255189 |
| 37 | 283309 |
| 38 | 313690 |
| 39 | 346450 |
[0,4,19,55,125,245,434,714,1110,1650,2365,3289, 4459,5915,7700,9860,12444,15504,19095,23275,28105, 33649,39974,47150,55250,64350,74529,85869,98455, 112375,127720,144584,163064,183260,205275,229215, 255189,283309,313690,346450] |