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 | 3 |
| 4 | 7 |
| 5 | 12 |
| 6 | 37 |
| 7 | 92 |
| 8 | 349 |
| 9 | 1308 |
| 10 | 5953 |
| 11 | 28228 |
| 12 | 144587 |
| 13 | 760110 |
| 14 | 4112548 |
| 15 | 22571040 |
| 16 | 125410355 |
| 17 | 702370208 |
| 18 | 3959139804 |
| 19 | 22425417824 |
| 20 | 127530813841 |
| 21 | 727630240536 |
| 22 | 4163114812854 |
| 23 | 23876534534362 |
| 24 | 137228556156385 |
| 25 | 790200525479706 |
| 26 | 4557943660928233 |
| 27 | 26331300028828400 |