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 | 7 |
| 3 | 19 |
| 4 | 31 |
| 5 | 79 |
| 6 | 127 |
| 7 | 199 |
| 8 | 499 |
| 9 | 1249 |
| 10 | 1279 |
| 11 | 1999 |
| 12 | 4999 |
| 13 | 5119 |
| 14 | 8191 |
| 15 | 12799 |
| 16 | 20479 |
| 17 | 31249 |
| 18 | 49999 |
| 19 | 51199 |
| 20 | 79999 |
| 21 | 81919 |
| 22 | 131071 |
| 23 | 199999 |
| 24 | 524287 |
| 25 | 799999 |
| 26 | 1249999 |
| 27 | 1310719 |
| 28 | 3124999 |
| 29 | 3276799 |
| 30 | 4999999 |
| 31 | 7812499 |
| 32 | 12499999 |
| 33 | 19999999 |
| 34 | 20479999 |