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 | 4 |
| 2 | 11 |
| 3 | 26 |
| 4 | 52 |
| 5 | 109 |
| 6 | 237 |
| 7 | 556 |
| 8 | 1405 |
| 9 | 3690 |
| 10 | 10085 |
| 11 | 28157 |
| 12 | 80071 |
| 13 | 230568 |
| 14 | 670122 |
| 15 | 1962690 |
| 16 | 5782468 |
| 17 | 17124206 |
| 18 | 50930440 |
| 19 | 152043592 |
| 20 | 455389240 |
| 21 | 1367883344 |
| 22 | 4119448337 |
| 23 | 12434731102 |
| 24 | 37613760490 |
| 25 | 113995567275 |
| 26 | 346090346047 |
| 27 | 1052421430209 |