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 | 4 |
| 4 | 11 |
| 5 | 24 |
| 6 | 55 |
| 7 | 128 |
| 8 | 298 |
| 9 | 693 |
| 10 | 1611 |
| 11 | 3745 |
| 12 | 8706 |
| 13 | 20239 |
| 14 | 47050 |
| 15 | 109378 |
| 16 | 254273 |
| 17 | 591113 |
| 18 | 1374171 |
| 19 | 3194560 |
| 20 | 7426451 |
| 21 | 17264404 |
| 22 | 40134870 |
| 23 | 93302253 |
| 24 | 216901423 |
| 25 | 504234633 |
| 26 | 1172203306 |
| 27 | 2725042075 |
| 28 | 6334954246 |
| 29 | 14726981894 |
| 30 | 34236079265 |