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 | 0 |
| 2 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 24 |
| 6 | 44 |
| 7 | 86 |
| 8 | 244 |
| 9 | 424 |
| 10 | 444 |
| 11 | 846 |
| 12 | 2444 |
| 13 | 4424 |
| 14 | 6286 |
| 15 | 42424 |
| 16 | 44244 |
| 17 | 240244 |
| 18 | 244086 |
| 19 | 244866 |
| 20 | 268286 |
| 21 | 420846 |
| 22 | 442244 |
| 23 | 446286 |
| 24 | 628646 |
| 25 | 880646 |
| 26 | 2402444 |
| 27 | 4402044 |
| 28 | 4442244 |
| 29 | 8448666 |
| 30 | 24040244 |
| 31 | 24064866 |
| 32 | 26682086 |
| 33 | 26682866 |
| 34 | 26828666 |
| 35 | 28244244 |
| 36 | 42400424 |