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 | 12 |
| 2 | 67 |
| 3 | 342 |
| 4 | 1717 |
| 5 | 8592 |
| 6 | 42967 |
| 7 | 214842 |
| 8 | 1074217 |
| 9 | 5371092 |
| 10 | 26855467 |
| 11 | 134277342 |
| 12 | 671386717 |
| 13 | 3356933592 |
| 14 | 16784667967 |
| 15 | 83923339842 |
| 16 | 419616699217 |
| 17 | 2098083496092 |
| 18 | 10490417480467 |
| 19 | 52452087402342 |
| 20 | 262260437011717 |
| 21 | 1311302185058592 |
| 22 | 6556510925292967 |