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 | 3 |
| 1 | 7 |
| 2 | 16 |
| 3 | 36 |
| 4 | 81 |
| 5 | 182 |
| 6 | 407 |
| 7 | 911 |
| 8 | 2038 |
| 9 | 4558 |
| 10 | 10192 |
| 11 | 22791 |
| 12 | 50963 |
| 13 | 113957 |
| 14 | 254816 |
| 15 | 569786 |
| 16 | 1274081 |
| 17 | 2848932 |
| 18 | 6370406 |
| 19 | 14244661 |
| 20 | 31852031 |
| 21 | 71223307 |
| 22 | 159260157 |
| 23 | 356116538 |
| 24 | 796300787 |
| 25 | 1780582691 |
| 26 | 3981503937 |
| 27 | 8902913456 |