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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 5 |
| 7 | 38 |
| 8 | 126 |
| 9 | 763 |
| 10 | 3133 |
| 11 | 16238 |
| 12 | 73471 |
| 13 | 351014 |
| 14 | 1598928 |
| 15 | 7535811 |
| 16 | 34241961 |
| 17 | 158047447 |
| 18 | 707980011 |
| 19 | 3201074948 |
| 20 | 14163106405 |
| 21 | 62844039157 |
| 22 | 274433474196 |
| 23 | 1196984190795 |