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 | 5 |
| 1 | 26 |
| 2 | 119 |
| 3 | 538 |
| 4 | 2310 |
| 5 | 9882 |
| 6 | 41715 |
| 7 | 175088 |
| 8 | 730626 |
| 9 | 3037510 |
| 10 | 12584726 |
| 11 | 52003792 |
| 12 | 214401024 |
| 13 | 882233898 |
| 14 | 3624161175 |
| 15 | 14865947668 |
| 16 | 60898934250 |
| 17 | 249184153548 |
| 18 | 1018532686314 |
| 19 | 4159265561360 |
| 20 | 16970015555220 |
| 21 | 69183689403686 |
| 22 | 281844056190294 |
| 23 | 1147419353238816 |
| 24 | 4668368905854840 |
| 25 | 18982659409726792 |