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 | 3 |
| 2 | 3 |
| 3 | 12 |
| 4 | 24 |
| 5 | 54 |
| 6 | 108 |
| 7 | 213 |
| 8 | 405 |
| 9 | 756 |
| 10 | 1386 |
| 11 | 2508 |
| 12 | 4488 |
| 13 | 7959 |
| 14 | 14007 |
| 15 | 24492 |
| 16 | 42588 |
| 17 | 73698 |
| 18 | 126996 |
| 19 | 218025 |
| 20 | 373065 |
| 21 | 636468 |
| 22 | 1082958 |
| 23 | 1838232 |
| 24 | 3113424 |
| 25 | 5262699 |
| 26 | 8879403 |
| 27 | 14956428 |
| 28 | 25153440 |
| 29 | 42241806 |
| 30 | 70844796 |
| 31 | 118668093 |
| 32 | 198543933 |
| 33 | 331824564 |
| 34 | 554012082 |
| 35 | 924092772 |