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 | 7 |
| 2 | 63 |
| 3 | 337 |
| 4 | 1319 |
| 5 | 3819 |
| 6 | 9763 |
| 7 | 21374 |
| 8 | 43774 |
| 9 | 81586 |
| 10 | 145138 |
| 11 | 243345 |
| 12 | 394696 |
| 13 | 612274 |
| 14 | 928616 |
| 15 | 1363401 |
| 16 | 1967428 |
| 17 | 2762729 |
| 18 | 3825273 |
| 19 | 5197436 |
| 20 | 6974412 |
| 21 | 9198648 |
| 22 | 12019669 |
| 23 | 15500750 |
| 24 | 19827441 |
| 25 | 25050955 |
| 26 | 31438147 |
| 27 | 39053729 |
| 28 | 48254762 |