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 | 1 |
| 2 | 4 |
| 3 | 12 |
| 4 | 30 |
| 5 | 78 |
| 6 | 184 |
| 7 | 448 |
| 8 | 1033 |
| 9 | 2361 |
| 10 | 5292 |
| 11 | 11676 |
| 12 | 25382 |
| 13 | 54470 |
| 14 | 115508 |
| 15 | 242132 |
| 16 | 502520 |
| 17 | 1032632 |
| 18 | 2103172 |
| 19 | 4246948 |
| 20 | 8507968 |
| 21 | 16915536 |
| 22 | 33391788 |
| 23 | 65470332 |
| 24 | 127539321 |
| 25 | 246928233 |
| 26 | 475274592 |
| 27 | 909658536 |
| 28 | 1731703788 |
| 29 | 3279644604 |
| 30 | 6180528236 |