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 | 2 |
| 2 | 7 |
| 3 | 57 |
| 4 | 182 |
| 5 | 2057 |
| 6 | 14557 |
| 7 | 45807 |
| 8 | 280182 |
| 9 | 6139557 |
| 10 | 25670807 |
| 11 | 123327057 |
| 12 | 5006139557 |
| 13 | 11109655182 |
| 14 | 102662389557 |
| 15 | 407838170807 |
| 16 | 3459595983307 |
| 17 | 79753541295807 |
| 18 | 365855836217682 |
| 19 | 2273204469030182 |
| 20 | 49956920289342682 |