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 | 8 |
| 2 | 42 |
| 3 | 208 |
| 4 | 1242 |
| 5 | 6856 |
| 6 | 43068 |
| 7 | 245860 |
| 8 | 1589346 |
| 9 | 9213728 |
| 10 | 60568000 |
| 11 | 354452340 |
| 12 | 2354520904 |
| 13 | 13870730416 |
| 14 | 92791873776 |
| 15 | 549357227852 |
| 16 | 3693928360378 |
| 17 | 21952690573088 |
| 18 | 148190103229340 |
| 19 | 883335481978896 |
| 20 | 5981390826179620 |