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 | 13 |
| 2 | 29 |
| 3 | 59 |
| 4 | 127 |
| 5 | 257 |
| 6 | 521 |
| 7 | 1049 |
| 8 | 2099 |
| 9 | 4201 |
| 10 | 8419 |
| 11 | 16843 |
| 12 | 33703 |
| 13 | 67409 |
| 14 | 134837 |
| 15 | 269683 |
| 16 | 539389 |
| 17 | 1078787 |
| 18 | 2157587 |
| 19 | 4315183 |
| 20 | 8630387 |
| 21 | 17260781 |
| 22 | 34521589 |
| 23 | 69043189 |
| 24 | 138086407 |
| 25 | 276172823 |
| 26 | 552345671 |
| 27 | 1104691373 |
| 28 | 2209382761 |