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 | 3 |
| 4 | 10 |
| 5 | 34 |
| 6 | 116 |
| 7 | 396 |
| 8 | 1353 |
| 9 | 4631 |
| 10 | 15895 |
| 11 | 54757 |
| 12 | 189465 |
| 13 | 658835 |
| 14 | 2303381 |
| 15 | 8098783 |
| 16 | 28642314 |
| 17 | 101894922 |
| 18 | 364614216 |
| 19 | 1312191768 |
| 20 | 4748561094 |
| 21 | 17275277322 |
| 22 | 63163858146 |
| 23 | 232041604038 |
| 24 | 856219298484 |
| 25 | 3172442815476 |
| 26 | 11799466553232 |
| 27 | 44041859928944 |
| 28 | 164924424558532 |
| 29 | 619454123593948 |