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 | 3 |
| 3 | 8 |
| 4 | 20 |
| 5 | 50 |
| 6 | 126 |
| 7 | 329 |
| 8 | 956 |
| 9 | 2897 |
| 10 | 8341 |
| 11 | 23238 |
| 12 | 66544 |
| 13 | 194686 |
| 14 | 555838 |
| 15 | 1532445 |
| 16 | 4225095 |
| 17 | 12140873 |
| 18 | 36623429 |
| 19 | 112964359 |
| 20 | 345148105 |
| 21 | 1027400959 |
| 22 | 2988415841 |
| 23 | 8604041257 |
| 24 | 24715209608 |
| 25 | 70743541258 |
| 26 | 201532200098 |
| 27 | 575286723544 |