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 | 5 |
| 2 | 55 |
| 3 | 574 |
| 4 | 7043 |
| 5 | 102370 |
| 6 | 1222003 |
| 7 | 13896979 |
| 8 | 152844768 |
| 9 | 1611113572 |
| 10 | 16626301609 |
| 11 | 171878734261 |
| 12 | 1781706224877 |