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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 20 |
| 6 | 1235 |
| 7 | 32396 |
| 8 | 605939 |
| 9 | 9446284 |
| 10 | 131733664 |
| 11 | 1706815354 |
| 12 | 21008871506 |
| 13 | 249145286508 |
| 14 | 2873325692759 |
| 15 | 32433194803107 |
| 16 | 359960491516138 |
| 17 | 3941261642520039 |
| 18 | 42679704453671033 |
| 19 | 457980431402674541 |