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 | 2 |
| 3 | 141 |
| 4 | 1035 |
| 5 | 2388 |
| 6 | 3973 |
| 7 | 5157 |
| 8 | 14160 |
| 9 | 37023 |
| 10 | 68861 |
| 11 | 99889 |
| 12 | 116106 |
| 13 | 117939 |
| 14 | 627400 |
| 15 | 1561944 |
| 16 | 1626983 |
| 17 | 5901444 |
| 18 | 10054091 |
| 19 | 12260525 |
| 20 | 32619981 |
| 21 | 49775099 |