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 | 4 |
| 2 | 3 |
| 3 | 8 |
| 4 | 18 |
| 5 | 47 |
| 6 | 108 |
| 7 | 268 |
| 8 | 638 |
| 9 | 1553 |
| 10 | 3761 |
| 11 | 9189 |
| 12 | 22453 |
| 13 | 55185 |
| 14 | 135894 |
| 15 | 335906 |
| 16 | 832312 |
| 17 | 2068066 |
| 18 | 5149845 |
| 19 | 12852750 |
| 20 | 32138353 |
| 21 | 80509495 |
| 22 | 202013368 |
| 23 | 507669048 |
| 24 | 1277586867 |
| 25 | 3219366610 |
| 26 | 8122275225 |