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 | 10 |
| 2 | 28 |
| 3 | 64 |
| 4 | 136 |
| 5 | 280 |
| 6 | 568 |
| 7 | 1144 |
| 8 | 2296 |
| 9 | 4600 |
| 10 | 9208 |
| 11 | 18424 |
| 12 | 36856 |
| 13 | 73720 |
| 14 | 147448 |
| 15 | 294904 |
| 16 | 589816 |
| 17 | 1179640 |
| 18 | 2359288 |
| 19 | 4718584 |
| 20 | 9437176 |
| 21 | 18874360 |
| 22 | 37748728 |
| 23 | 75497464 |
| 24 | 150994936 |
| 25 | 301989880 |
| 26 | 603979768 |
| 27 | 1207959544 |
| 28 | 2415919096 |