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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 7 |
| 5 | 228 |
| 6 | 235 |
| 7 | 463 |
| 8 | 128949 |
| 9 | 129412 |
| 10 | 258361 |
| 11 | 646134 |
| 12 | 3489031 |
| 13 | 4135165 |
| 14 | 20029691 |
| 15 | 24164856 |
| 16 | 92524259 |
| 17 | 671834669 |
| 18 | 764358928 |
| 19 | 1436193597 |
| 20 | 63956877196 |
| 21 | 65393070793 |
| 22 | 325529160368 |
| 23 | 716451391529 |
| 24 | 1041980551897 |
| 25 | 1758431943426 |
| 26 | 4558844438749 |
| 27 | 38229187453418 |
| 28 | 81017219345585 |
| 29 | 119246406799003 |