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 | 2 |
| 3 | 6 |
| 4 | 21 |
| 5 | 76 |
| 6 | 277 |
| 7 | 1016 |
| 8 | 3756 |
| 9 | 13998 |
| 10 | 52554 |
| 11 | 198568 |
| 12 | 754316 |
| 13 | 2878552 |
| 14 | 11027384 |
| 15 | 42384412 |
| 16 | 163372325 |
| 17 | 631290168 |
| 18 | 2444700421 |
| 19 | 9485463044 |
| 20 | 36866810877 |
| 21 | 143508889270 |
| 22 | 559399074443 |
| 23 | 2183269032876 |
| 24 | 8530724152279 |
| 25 | 33366805383326 |
| 26 | 130633854520329 |
| 27 | 511889287682280 |