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) |
|---|---|
| 1 | 51 |
| 2 | 2601 |
| 3 | 22110 |
| 4 | 211555 |
| 5 | 912667 |
| 6 | 4245574 |
| 7 | 13126812 |
| 8 | 42012357 |
| 9 | 106570618 |
| 10 | 272337497 |
| 11 | 604928942 |
| 12 | 1330976409 |
| 13 | 2684633348 |
| 14 | 5309403837 |
| 15 | 9945849384 |
| 16 | 18160668025 |
| 17 | 32072067434 |
| 18 | 55037496090 |
| 19 | 92610159756 |
| 20 | 151216855067 |