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 | 8 |
| 2 | 38 |
| 3 | 212 |
| 4 | 1370 |
| 5 | 10112 |
| 6 | 84158 |
| 7 | 780908 |
| 8 | 8000882 |
| 9 | 89763320 |
| 10 | 1094915222 |
| 11 | 14431179908 |
| 12 | 204423631178 |
| 13 | 3097603939952 |
| 14 | 50001759773870 |
| 15 | 856665220770332 |
| 16 | 15526612798028258 |
| 17 | 296825612428239848 |
| 18 | 5969385443426556422 |
| 19 | 125983618731675924020 |
| 20 | 2784204907403441680442 |