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 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 15 |
| 6 | 29 |
| 7 | 59 |
| 8 | 126 |
| 9 | 262 |
| 10 | 542 |
| 11 | 1121 |
| 12 | 2328 |
| 13 | 4839 |
| 14 | 10039 |
| 15 | 20827 |
| 16 | 43220 |
| 17 | 89704 |
| 18 | 186172 |
| 19 | 386345 |
| 20 | 801768 |
| 21 | 1663916 |
| 22 | 3453137 |
| 23 | 7166272 |
| 24 | 14872078 |
| 25 | 30863935 |
| 26 | 64051787 |
| 27 | 132926308 |
| 28 | 275861116 |
| 29 | 572492846 |
| 30 | 1188091024 |
| 31 | 2465638247 |