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 | 2 |
| 2 | 5 |
| 3 | 12 |
| 4 | 28 |
| 5 | 66 |
| 6 | 156 |
| 7 | 368 |
| 8 | 868 |
| 9 | 2048 |
| 10 | 4832 |
| 11 | 11400 |
| 12 | 26896 |
| 13 | 63456 |
| 14 | 149712 |
| 15 | 353216 |
| 16 | 833344 |
| 17 | 1966112 |
| 18 | 4638656 |
| 19 | 10944000 |
| 20 | 25820224 |
| 21 | 60917760 |
| 22 | 143723520 |
| 23 | 339087488 |
| 24 | 800010496 |
| 25 | 1887468032 |
| 26 | 4453111040 |
| 27 | 10506243072 |
| 28 | 24787422208 |
| 29 | 58481066496 |