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 | 8 |
| 3 | 23 |
| 4 | 76 |
| 5 | 294 |
| 6 | 1328 |
| 7 | 6933 |
| 8 | 41350 |
| 9 | 278679 |
| 10 | 2101433 |
| 11 | 17574551 |
| 12 | 161740315 |
| 13 | 1626733107 |
| 14 | 17771416520 |
| 15 | 209739328923 |
| 16 | 2661301094007 |
| 17 | 36148700652162 |
| 18 | 523597247829866 |
| 19 | 8059284921781891 |
| 20 | 131408547139817540 |