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 | 1 |
| 2 | 13 |
| 3 | 108 |
| 4 | 793 |
| 5 | 5611 |
| 6 | 39312 |
| 7 | 274933 |
| 8 | 1923025 |
| 9 | 13455396 |
| 10 | 94169413 |
| 11 | 659134543 |
| 12 | 4613813568 |
| 13 | 32296413241 |
| 14 | 226074381637 |
| 15 | 1582520088348 |
| 16 | 11077641280225 |
| 17 | 77543496352291 |
| 18 | 542804506787088 |
| 19 | 3799631657379853 |
| 20 | 26597421924762793 |