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 | 40 |
| 2 | 819 |
| 3 | 11440 |
| 4 | 122589 |
| 5 | 1074488 |
| 6 | 8020830 |
| 7 | 52427192 |
| 8 | 306189025 |
| 9 | 1622495952 |
| 10 | 7895219982 |
| 11 | 35623107520 |
| 12 | 150221110689 |
| 13 | 595982725640 |
| 14 | 2237008815175 |
| 15 | 7981961442768 |
| 16 | 27186526166255 |
| 17 | 88708246063240 |
| 18 | 278172606877930 |