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 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 22 |
| 4 | 47 |
| 5 | 69 |
| 6 | 1013 |
| 7 | 1082 |
| 8 | 3177 |
| 9 | 23321 |
| 10 | 49819 |
| 11 | 73140 |
| 12 | 1073779 |
| 13 | 1146919 |
| 14 | 3367617 |
| 15 | 24720238 |
| 16 | 52808093 |
| 17 | 77528331 |
| 18 | 1138204727 |
| 19 | 1215733058 |
| 20 | 3569670843 |
| 21 | 26203428959 |
| 22 | 55976528761 |
| 23 | 82179957720 |