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 | 10 |
| 3 | 26 |
| 4 | 68 |
| 5 | 176 |
| 6 | 458 |
| 7 | 1193 |
| 8 | 3103 |
| 9 | 8069 |
| 10 | 20982 |
| 11 | 54556 |
| 12 | 141854 |
| 13 | 368847 |
| 14 | 959072 |
| 15 | 2493770 |
| 16 | 6484280 |
| 17 | 16860367 |
| 18 | 43840173 |
| 19 | 113992823 |
| 20 | 296403114 |
| 21 | 770704718 |
| 22 | 2003979505 |
| 23 | 5210729566 |
| 24 | 13548892363 |
| 25 | 35229708616 |
| 26 | 91603972925 |
| 27 | 238187830252 |