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) |
|---|---|
| 2 | 1 |
| 3 | 12 |
| 4 | 157 |
| 5 | 1750 |
| 6 | 17446 |
| 7 | 164108 |
| 8 | 1505099 |
| 9 | 13720902 |
| 10 | 125782441 |
| 11 | 1167813944 |
| 12 | 11029947952 |
| 13 | 106273227216 |
| 14 | 1046320856673 |
| 15 | 10537366304920 |
| 16 | 108606982421301 |
| 17 | 1145873284492738 |
| 18 | 12375688888657414 |
| 19 | 136802023177966948 |
| 20 | 1547385154016264531 |