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 | 11 |
| 4 | 23 |
| 5 | 47 |
| 6 | 149 |
| 7 | 359 |
| 8 | 719 |
| 9 | 1439 |
| 10 | 2879 |
| 11 | 12097 |
| 12 | 24197 |
| 13 | 48407 |
| 14 | 96821 |
| 15 | 193649 |
| 16 | 968237 |
| 17 | 2614327 |
| 18 | 5809201 |
| 19 | 11618413 |
| 20 | 25055857 |
| 21 | 75167579 |
| 22 | 225502703 |
| 23 | 451005407 |
| 24 | 2109888899 |
| 25 | 4510054327 |
| 26 | 14500925539 |
| 27 | 43502776619 |
| 28 | 87005553241 |
| 29 | 174011106487 |