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) |
|---|---|
| 2 | 3 |
| 3 | 35 |
| 4 | 269 |
| 5 | 1723 |
| 6 | 10123 |
| 7 | 56757 |
| 8 | 309755 |
| 9 | 1663515 |
| 10 | 8846821 |
| 11 | 46767491 |
| 12 | 246319875 |
| 13 | 1294402053 |
| 14 | 6792548971 |
| 15 | 35614277883 |
| 16 | 186632524741 |
| 17 | 977711862035 |
| 18 | 5120933346419 |