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 | 4 |
| 2 | 17 |
| 3 | 58 |
| 4 | 186 |
| 5 | 546 |
| 6 | 1532 |
| 7 | 4082 |
| 8 | 10502 |
| 9 | 26096 |
| 10 | 63075 |
| 11 | 148536 |
| 12 | 342096 |
| 13 | 771744 |
| 14 | 1709299 |
| 15 | 3721792 |
| 16 | 7978972 |
| 17 | 16860328 |
| 18 | 35155475 |
| 19 | 72393580 |
| 20 | 147351112 |
| 21 | 296657196 |
| 22 | 591141762 |
| 23 | 1166570452 |
| 24 | 2281101159 |
| 25 | 4421781894 |
| 26 | 8500806341 |
| 27 | 16214549920 |
| 28 | 30696683828 |