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 | 7 |
| 2 | 19 |
| 3 | 79 |
| 4 | 331 |
| 5 | 751 |
| 6 | 1171 |
| 7 | 7459 |
| 8 | 10651 |
| 9 | 18379 |
| 10 | 78439 |
| 11 | 78439 |
| 12 | 399499 |
| 13 | 644869 |
| 14 | 1427911 |
| 15 | 1427911 |
| 16 | 4355311 |
| 17 | 5715319 |
| 18 | 43030381 |
| 19 | 43030381 |
| 20 | 163384621 |