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 | 3 |
| 2 | 18 |
| 3 | 158 |
| 4 | 1611 |
| 5 | 17811 |
| 6 | 207395 |
| 7 | 2505858 |
| 8 | 31125711 |
| 9 | 394982973 |
| 10 | 5098498323 |
| 11 | 66733261455 |
| 12 | 883602795509 |
| 13 | 11814191512434 |
| 14 | 159283419280014 |
| 15 | 2163058572006613 |