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 | 4 |
| 2 | 12 |
| 3 | 28 |
| 4 | 84 |
| 5 | 124 |
| 6 | 972 |
| 7 | 508 |
| 8 | 8020 |
| 9 | 17164 |
| 10 | 130092 |
| 11 | 8188 |
| 12 | 1794156 |
| 13 | 32764 |
| 14 | 23609052 |
| 15 | 55986868 |
| 16 | 274827860 |
| 17 | 524284 |
| 18 | 5338824444 |
| 19 | 2097148 |
| 20 | 63030243724 |
| 21 | 117928401724 |
| 22 | 995282568732 |
| 23 | 33554428 |
| 24 | 15265553226604 |
| 25 | 14283226194724 |
| 26 | 216345187553052 |