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 | 5 |
| 2 | 19 |
| 3 | 62 |
| 4 | 184 |
| 5 | 512 |
| 6 | 1360 |
| 7 | 3488 |
| 8 | 8704 |
| 9 | 21248 |
| 10 | 50944 |
| 11 | 120320 |
| 12 | 280576 |
| 13 | 647168 |
| 14 | 1478656 |
| 15 | 3350528 |
| 16 | 7536640 |
| 17 | 16842752 |
| 18 | 37421056 |
| 19 | 82706432 |
| 20 | 181927936 |
| 21 | 398458880 |
| 22 | 869269504 |
| 23 | 1889533952 |
| 24 | 4093640704 |
| 25 | 8841592832 |
| 26 | 19042140160 |
| 27 | 40902852608 |