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 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 33 |
| 6 | 82 |
| 7 | 201 |
| 8 | 488 |
| 9 | 1176 |
| 10 | 2817 |
| 11 | 6714 |
| 12 | 15931 |
| 13 | 37647 |
| 14 | 88628 |
| 15 | 207914 |
| 16 | 486158 |
| 17 | 1133304 |
| 18 | 2634339 |
| 19 | 6106953 |
| 20 | 14121157 |
| 21 | 32573842 |
| 22 | 74968044 |
| 23 | 172164086 |
| 24 | 394561089 |
| 25 | 902471184 |
| 26 | 2060338222 |
| 27 | 4695324425 |
| 28 | 10681885697 |
| 29 | 24261437446 |
| 30 | 55017434305 |
| 31 | 124573678280 |