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 | 15 |
| 1 | 175 |
| 2 | 1050 |
| 3 | 4410 |
| 4 | 14700 |
| 5 | 41580 |
| 6 | 103950 |
| 7 | 235950 |
| 8 | 495495 |
| 9 | 975975 |
| 10 | 1821820 |
| 11 | 3248700 |
| 12 | 5569200 |
| 13 | 9224880 |
| 14 | 14825700 |
| 15 | 23197860 |
| 16 | 35441175 |
| 17 | 52997175 |
| 18 | 77729190 |
| 19 | 112015750 |
| 20 | 158858700 |
| 21 | 222007500 |
| 22 | 306101250 |
| 23 | 416830050 |
| 24 | 561117375 |
| 25 | 747325215 |
| 26 | 985483800 |
| 27 | 1287547800 |