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 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 17 |
| 5 | 43 |
| 6 | 114 |
| 7 | 310 |
| 8 | 861 |
| 9 | 2433 |
| 10 | 6970 |
| 11 | 20198 |
| 12 | 59101 |
| 13 | 174373 |
| 14 | 518179 |
| 15 | 1549545 |
| 16 | 4659399 |
| 17 | 14079553 |
| 18 | 42732230 |
| 19 | 130208246 |
| 20 | 398174723 |
| 21 | 1221573603 |
| 22 | 3758835953 |
| 23 | 11597578995 |
| 24 | 35872937745 |
| 25 | 111216324015 |
| 26 | 345539568900 |
| 27 | 1075693015920 |