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 | 2 |
| 2 | 3 |
| 3 | 8 |
| 4 | 13 |
| 5 | 30 |
| 6 | 55 |
| 7 | 116 |
| 8 | 225 |
| 9 | 458 |
| 10 | 907 |
| 11 | 1824 |
| 12 | 3637 |
| 13 | 7286 |
| 14 | 14559 |
| 15 | 29132 |
| 16 | 58249 |
| 17 | 116514 |
| 18 | 233011 |
| 19 | 466040 |
| 20 | 932061 |
| 21 | 1864142 |
| 22 | 3728263 |
| 23 | 7456548 |
| 24 | 14913073 |
| 25 | 29826170 |
| 26 | 59652315 |
| 27 | 119304656 |
| 28 | 238609285 |
| 29 | 477218598 |
| 30 | 954437167 |