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 | 3 |
| 2 | 11 |
| 3 | 29 |
| 4 | 109 |
| 5 | 287 |
| 6 | 1079 |
| 7 | 2841 |
| 8 | 10681 |
| 9 | 28123 |
| 10 | 105731 |
| 11 | 278389 |
| 12 | 1046629 |
| 13 | 2755767 |
| 14 | 10360559 |
| 15 | 27279281 |
| 16 | 102558961 |
| 17 | 270037043 |
| 18 | 1015229051 |
| 19 | 2673091149 |
| 20 | 10049731549 |
| 21 | 26460874447 |
| 22 | 99482086439 |
| 23 | 261935653321 |
| 24 | 984771132841 |
| 25 | 2592895658763 |
| 26 | 9748229241971 |