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 | 1 |
| 1 | 2 |
| 2 | 97 |
| 3 | 196 |
| 4 | 9505 |
| 5 | 19206 |
| 6 | 931393 |
| 7 | 1881992 |
| 8 | 91267009 |
| 9 | 184416010 |
| 10 | 8943235489 |
| 11 | 18070886988 |
| 12 | 876345810913 |
| 13 | 1770762508814 |
| 14 | 85872946233985 |
| 15 | 173516654976784 |
| 16 | 8414672385119617 |
| 17 | 17002861425216018 |
| 18 | 824552020795488481 |
| 19 | 1666106903016192980 |
| 20 | 80797683365572751521 |