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 | 2 |
| 2 | 14 |
| 3 | 158 |
| 4 | 1886 |
| 5 | 22622 |
| 6 | 271454 |
| 7 | 3257438 |
| 8 | 39089246 |
| 9 | 469070942 |
| 10 | 5628851294 |
| 11 | 67546215518 |
| 12 | 810554586206 |
| 13 | 9726655034462 |
| 14 | 116719860413534 |
| 15 | 1400638324962398 |
| 16 | 16807659899548766 |
| 17 | 201691918794585182 |
| 18 | 2420303025535022174 |
| 19 | 29043636306420266078 |
| 20 | 348523635677043192926 |