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 | 63 |
| 2 | 255 |
| 3 | 863 |
| 4 | 2655 |
| 5 | 7683 |
| 6 | 21287 |
| 7 | 57071 |
| 8 | 149087 |
| 9 | 381311 |
| 10 | 958207 |
| 11 | 2372095 |
| 12 | 5796863 |
| 13 | 14007295 |
| 14 | 33511423 |
| 15 | 79466495 |
| 16 | 186949631 |
| 17 | 436666367 |
| 18 | 1013317631 |
| 19 | 2337538047 |
| 20 | 5362941951 |
| 21 | 12242386943 |
| 22 | 27817148415 |
| 23 | 62934482943 |
| 24 | 141815709695 |
| 25 | 318372839423 |
| 26 | 712243150847 |