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 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 13 |
| 5 | 19 |
| 6 | 70 |
| 7 | 166 |
| 8 | 307 |
| 9 | 853 |
| 10 | 2164 |
| 11 | 4600 |
| 12 | 11491 |
| 13 | 29137 |
| 14 | 66808 |
| 15 | 161692 |
| 16 | 403843 |
| 17 | 961129 |
| 18 | 2316238 |
| 19 | 5715742 |
| 20 | 13831219 |
| 21 | 33450073 |
| 22 | 82013692 |
| 23 | 199820584 |
| 24 | 485389276 |
| 25 | 1187152906 |
| 26 | 2900334583 |
| 27 | 7069398325 |
| 28 | 17283884710 |
| 29 | 42278723290 |
| 30 | 103291322056 |
| 31 | 252668924536 |