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 | 4 |
| 2 | 8 |
| 3 | 22 |
| 4 | 64 |
| 5 | 205 |
| 6 | 683 |
| 7 | 2341 |
| 8 | 8192 |
| 9 | 29128 |
| 10 | 104858 |
| 11 | 381301 |
| 12 | 1398102 |
| 13 | 5162221 |
| 14 | 19173962 |
| 15 | 71582789 |
| 16 | 268435456 |
| 17 | 1010580541 |
| 18 | 3817748708 |
| 19 | 14467258261 |
| 20 | 54975581389 |
| 21 | 209430786244 |
| 22 | 799644820201 |
| 23 | 3059510616421 |
| 24 | 11728124029611 |