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) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 7 |
| 4 | 17 |
| 5 | 33 |
| 6 | 57 |
| 7 | 107 |
| 8 | 197 |
| 9 | 361 |
| 10 | 665 |
| 11 | 1223 |
| 12 | 2249 |
| 13 | 4137 |
| 14 | 7609 |
| 15 | 13995 |
| 16 | 25741 |
| 17 | 47345 |
| 18 | 87081 |
| 19 | 160167 |
| 20 | 294593 |
| 21 | 541841 |
| 22 | 996601 |
| 23 | 1833035 |
| 24 | 3371477 |
| 25 | 6201113 |
| 26 | 11405625 |
| 27 | 20978215 |
| 28 | 38584953 |
| 29 | 70968793 |
| 30 | 130531961 |