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 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 23 |
| 6 | 171 |
| 7 | 172 |
| 8 | 217 |
| 9 | 438 |
| 10 | 2562 |
| 11 | 2781 |
| 12 | 2879 |
| 13 | 3714 |
| 14 | 4391 |
| 15 | 10819 |
| 16 | 14591 |
| 17 | 25053 |
| 18 | 27768 |
| 19 | 40167 |
| 20 | 180991 |
| 21 | 193906 |