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 | 2 |
| 2 | 6 |
| 3 | 17 |
| 4 | 47 |
| 5 | 121 |
| 6 | 291 |
| 7 | 665 |
| 8 | 1467 |
| 9 | 3162 |
| 10 | 6718 |
| 11 | 14156 |
| 12 | 29702 |
| 13 | 62190 |
| 14 | 130060 |
| 15 | 271760 |
| 16 | 567488 |
| 17 | 1184917 |
| 18 | 2475907 |
| 19 | 5181798 |
| 20 | 10869647 |
| 21 | 22858188 |
| 22 | 48178441 |
| 23 | 101712259 |
| 24 | 214900119 |
| 25 | 454006064 |
| 26 | 958316150 |
| 27 | 2019797853 |
| 28 | 4248758319 |
| 29 | 8917387482 |
| 30 | 18670242203 |
| 31 | 38989676130 |