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 | 2 |
| 1 | 3 |
| 2 | 7 |
| 3 | 19 |
| 4 | 53 |
| 5 | 149 |
| 6 | 401 |
| 7 | 1097 |
| 8 | 2971 |
| 9 | 8101 |
| 10 | 22027 |
| 11 | 59879 |
| 12 | 162751 |
| 13 | 442399 |
| 14 | 1202603 |
| 15 | 3269011 |
| 16 | 8886109 |
| 17 | 24154957 |
| 18 | 65659969 |
| 19 | 178482289 |
| 20 | 485165237 |
| 21 | 1318815713 |
| 22 | 3584912833 |
| 23 | 9744803443 |
| 24 | 26489122147 |
| 25 | 72004899319 |