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 | 3 |
| 3 | 23 |
| 4 | 82 |
| 5 | 297 |
| 6 | 1000 |
| 7 | 3268 |
| 8 | 10534 |
| 9 | 33799 |
| 10 | 107901 |
| 11 | 343155 |
| 12 | 1090189 |
| 13 | 3460380 |
| 14 | 10970774 |
| 15 | 34749182 |
| 16 | 109991778 |
| 17 | 348006756 |
| 18 | 1101058505 |
| 19 | 3483105232 |
| 20 | 11017518803 |