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 | 1 |
| 2 | 5 |
| 3 | 16 |
| 4 | 61 |
| 5 | 226 |
| 6 | 884 |
| 7 | 3543 |
| 8 | 14429 |
| 9 | 59623 |
| 10 | 248950 |
| 11 | 1049159 |
| 12 | 4454356 |
| 13 | 19032976 |
| 14 | 81769735 |
| 15 | 352967821 |
| 16 | 1529948477 |
| 17 | 6655903632 |
| 18 | 29050257899 |
| 19 | 127162016206 |
| 20 | 558088733406 |
| 21 | 2455157735151 |
| 22 | 10824115727199 |
| 23 | 47814658900427 |