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) |
|---|---|
| 3 | 719 |
| 4 | 5039 |
| 5 | 20159 |
| 6 | 60479 |
| 7 | 151199 |
| 8 | 332639 |
| 9 | 665279 |
| 10 | 1235519 |
| 11 | 2162159 |
| 12 | 3603599 |
| 13 | 5765759 |
| 14 | 8910719 |
| 15 | 13366079 |
| 16 | 19535039 |
| 17 | 27907199 |
| 18 | 39070079 |
| 19 | 53721359 |
| 20 | 72681839 |
| 21 | 96909119 |
| 22 | 127511999 |
| 23 | 165765599 |
| 24 | 213127199 |
| 25 | 271252799 |
| 26 | 342014399 |
| 27 | 427517999 |