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 | 3 |
| 2 | 20 |
| 3 | 254 |
| 4 | 4632 |
| 5 | 110408 |
| 6 | 3243617 |
| 7 | 113177496 |
| 8 | 4570858599 |
| 9 | 209655304352 |
| 10 | 10763674952097 |
| 11 | 611433842280387 |
| 12 | 38071427445729200 |
| 13 | 2578294348444597266 |
| 14 | 188670154792420320214 |
| 15 | 14834716200104606205407 |
| 16 | 1247263229999781126495327 |
| 17 | 111661618863544248806155259 |