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 | -2 |
| 2 | -2 |
| 3 | 2 |
| 4 | 28 |
| 5 | 158 |
| 6 | 748 |
| 7 | 3302 |
| 8 | 14068 |
| 9 | 58718 |
| 10 | 241948 |
| 11 | 988502 |
| 12 | 4015108 |
| 13 | 16241678 |
| 14 | 65506348 |
| 15 | 263636102 |
| 16 | 1059360148 |
| 17 | 4251855038 |
| 18 | 17050597948 |
| 19 | 68331794102 |
| 20 | 273715121188 |
| 21 | 1096023794798 |
| 22 | 4387584060748 |
| 23 | 17560800790502 |
| 24 | 70274592610228 |