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 | 3 |
| 2 | 6 |
| 3 | 12 |
| 4 | 22 |
| 5 | 39 |
| 6 | 78 |
| 7 | 132 |
| 8 | 269 |
| 9 | 526 |
| 10 | 1036 |
| 11 | 2067 |
| 12 | 4162 |
| 13 | 8252 |
| 14 | 16387 |
| 15 | 32662 |
| 16 | 65372 |
| 17 | 130953 |
| 18 | 262212 |
| 19 | 524550 |
| 20 | 1047850 |
| 21 | 2097353 |
| 22 | 4192505 |
| 23 | 8384471 |