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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 16 |
| 5 | 43 |
| 6 | 107 |
| 7 | 271 |
| 8 | 695 |
| 9 | 1769 |
| 10 | 4499 |
| 11 | 11464 |
| 12 | 29202 |
| 13 | 74360 |
| 14 | 189382 |
| 15 | 482339 |
| 16 | 1228417 |
| 17 | 3128538 |
| 18 | 7967848 |
| 19 | 20292665 |
| 20 | 51681683 |
| 21 | 131623881 |
| 22 | 335222157 |
| 23 | 853749843 |
| 24 | 2174345679 |
| 25 | 5537663440 |
| 26 | 14103422412 |
| 27 | 35918853816 |
| 28 | 91478793556 |
| 29 | 232979863477 |
| 30 | 593357374127 |