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 | 1 |
| 2 | 6 |
| 3 | 16 |
| 4 | 51 |
| 5 | 127 |
| 6 | 367 |
| 7 | 897 |
| 8 | 2342 |
| 9 | 5662 |
| 10 | 13894 |
| 11 | 32656 |
| 12 | 77076 |
| 13 | 176586 |
| 14 | 403526 |
| 15 | 904140 |
| 16 | 2013267 |
| 17 | 4418167 |
| 18 | 9628682 |
| 19 | 20741434 |
| 20 | 44362988 |
| 21 | 93984842 |
| 22 | 197731390 |
| 23 | 412619250 |
| 24 | 855408327 |
| 25 | 1760687593 |
| 26 | 3601827236 |
| 27 | 7321181534 |
| 28 | 14796204874 |
| 29 | 29730215150 |
| 30 | 59419375058 |