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) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 14 |
| 4 | 72 |
| 5 | 385 |
| 6 | 2110 |
| 7 | 11757 |
| 8 | 66298 |
| 9 | 377245 |
| 10 | 2161771 |
| 11 | 12458186 |
| 12 | 72130114 |
| 13 | 419239101 |
| 14 | 2444741300 |
| 15 | 14296415880 |
| 16 | 83807317674 |
| 17 | 492339686501 |
| 18 | 2897788821746 |
| 19 | 17084275066796 |
| 20 | 100873614561368 |