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 | 0 |
| 1 | 5 |
| 2 | 44 |
| 3 | 321 |
| 4 | 2184 |
| 5 | 14325 |
| 6 | 91860 |
| 7 | 580097 |
| 8 | 3622928 |
| 9 | 22437477 |
| 10 | 138049020 |
| 11 | 844881345 |
| 12 | 5148375192 |
| 13 | 31258302933 |
| 14 | 189199514532 |
| 15 | 1142148091905 |
| 16 | 6878977097760 |
| 17 | 41347348295877 |
| 18 | 248082231062988 |
| 19 | 1486116788646977 |