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 | 4 |
| 3 | 9 |
| 4 | 22 |
| 5 | 57 |
| 6 | 155 |
| 7 | 441 |
| 8 | 1311 |
| 9 | 4066 |
| 10 | 13130 |
| 11 | 44046 |
| 12 | 153144 |
| 13 | 550706 |
| 14 | 2044248 |
| 15 | 7819897 |
| 16 | 30779570 |
| 17 | 124487688 |
| 18 | 516723174 |
| 19 | 2198726181 |
| 20 | 9581247648 |
| 21 | 42717268934 |
| 22 | 194688593966 |
| 23 | 906331074605 |
| 24 | 4306472500778 |
| 25 | 20871165469241 |
| 26 | 103106015116437 |