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 | 3 |
| 2 | 9 |
| 3 | 22 |
| 4 | 46 |
| 5 | 86 |
| 6 | 148 |
| 7 | 239 |
| 8 | 372 |
| 9 | 576 |
| 10 | 915 |
| 11 | 1520 |
| 12 | 2639 |
| 13 | 4711 |
| 14 | 8471 |
| 15 | 15107 |
| 16 | 26516 |
| 17 | 45758 |
| 18 | 77899 |
| 19 | 131586 |
| 20 | 221935 |
| 21 | 375670 |
| 22 | 640002 |
| 23 | 1097628 |
| 24 | 1891754 |
| 25 | 3267763 |
| 26 | 5643077 |
| 27 | 9725666 |
| 28 | 16717471 |
| 29 | 28666522 |
| 30 | 49078549 |
| 31 | 83978278 |
| 32 | 143744065 |
| 33 | 246264367 |