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 | 12 |
| 2 | 144 |
| 3 | 636 |
| 4 | 2079 |
| 5 | 8904 |
| 6 | 34012 |
| 7 | 145775 |
| 8 | 597856 |
| 9 | 2579940 |
| 10 | 10954895 |
| 11 | 47622744 |
| 12 | 205998660 |
| 13 | 901433351 |
| 14 | 3942155568 |
| 15 | 17346881260 |
| 16 | 76402898495 |
| 17 | 337745931240 |
| 18 | 1495044223756 |
| 19 | 6633766629567 |
| 20 | 29474645542848 |
| 21 | 131183330978644 |