This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 21 |
| 3 | 56 |
| 4 | 126 |
| 5 | 251 |
| 6 | 456 |
| 7 | 771 |
| 8 | 1231 |
| 9 | 1876 |
| 10 | 2751 |
| 11 | 3906 |
| 12 | 5396 |
| 13 | 7281 |
| 14 | 9626 |
| 15 | 12501 |
| 16 | 15981 |
| 17 | 20146 |
| 18 | 25081 |
| 19 | 30876 |
| 20 | 37626 |
| 21 | 45431 |
| 22 | 54396 |
| 23 | 64631 |
| 24 | 76251 |
| 25 | 89376 |
| 26 | 104131 |
| 27 | 120646 |
| 28 | 139056 |
| 29 | 159501 |
| 30 | 182126 |