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 | 7 |
| 3 | 19 |
| 4 | 54 |
| 5 | 134 |
| 6 | 354 |
| 7 | 838 |
| 8 | 2057 |
| 9 | 4794 |
| 10 | 11232 |
| 11 | 25412 |
| 12 | 58075 |
| 13 | 128670 |
| 14 | 286152 |
| 15 | 625829 |
| 16 | 1365653 |
| 17 | 2941088 |
| 18 | 6331146 |
| 19 | 13474533 |
| 20 | 28642325 |
| 21 | 60404681 |
| 22 | 127082128 |
| 23 | 265712673 |
| 24 | 554608226 |
| 25 | 1151374963 |
| 26 | 2385950536 |
| 27 | 4924685252 |
| 28 | 10145267212 |
| 29 | 20831428273 |
| 30 | 42708248451 |