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 | 676 |
| 2 | 5130 |
| 3 | 37642 |
| 4 | 189580 |
| 5 | 969528 |
| 6 | 3811097 |
| 7 | 15164049 |
| 8 | 50226272 |
| 9 | 167435933 |
| 10 | 488825091 |
| 11 | 1431119793 |
| 12 | 3794040002 |
| 13 | 10068045085 |
| 14 | 24759248822 |
| 15 | 60904889948 |
| 16 | 141191889755 |
| 17 | 327408688415 |
| 18 | 724682233233 |
| 19 | 1605043691566 |
| 20 | 3427407495669 |