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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 6 |
| 3 | 22 |
| 4 | 93 |
| 5 | 417 |
| 6 | 1993 |
| 7 | 9864 |
| 8 | 50217 |
| 9 | 261239 |
| 10 | 1382448 |
| 11 | 7418877 |
| 12 | 40278175 |
| 13 | 220830513 |
| 14 | 1220930337 |
| 15 | 6799458685 |
| 16 | 38107621704 |
| 17 | 214771481163 |
| 18 | 1216457185122 |
| 19 | 6920603372448 |
| 20 | 39529745832681 |
| 21 | 226605757331904 |
| 22 | 1303291125124071 |
| 23 | 7518151040142000 |
| 24 | 43488151271999326 |