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 | 8 |
| 3 | 35 |
| 4 | 119 |
| 5 | 433 |
| 6 | 1476 |
| 7 | 4962 |
| 8 | 16128 |
| 9 | 51367 |
| 10 | 160105 |
| 11 | 490219 |
| 12 | 1476420 |
| 13 | 4378430 |
| 14 | 12805008 |
| 15 | 36962779 |
| 16 | 105417214 |
| 17 | 297265597 |
| 18 | 829429279 |
| 19 | 2291305897 |
| 20 | 6270497702 |
| 21 | 17008094490 |
| 22 | 45744921052 |
| 23 | 122052000601 |
| 24 | 323166712109 |
| 25 | 849453194355 |
| 26 | 2217289285055 |
| 27 | 5749149331789 |