The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 15 |
| 5 | 22 |
| 6 | 30 |
| 7 | 40 |
| 8 | 51 |
| 9 | 63 |
| 10 | 76 |
| 11 | 90 |
| 12 | 106 |
| 13 | 123 |
| 14 | 141 |
| 15 | 160 |
| 16 | 180 |
| 17 | 201 |
| 18 | 224 |
| 19 | 248 |
| 20 | 273 |
| 21 | 299 |
[1,4,9,15,22,30,40,51,63,76,90,106,123,141,160, 180,201,224,248,273,299] |