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) |
|---|---|
| 0 | 10 |
| 1 | 54 |
| 2 | 274 |
| 3 | 1374 |
| 4 | 6874 |
| 5 | 34374 |
| 6 | 171874 |
| 7 | 859374 |
| 8 | 4296874 |
| 9 | 21484374 |
| 10 | 107421874 |
| 11 | 537109374 |
| 12 | 2685546874 |
| 13 | 13427734374 |
| 14 | 67138671874 |
| 15 | 335693359374 |
| 16 | 1678466796874 |
| 17 | 8392333984374 |
| 18 | 41961669921874 |
| 19 | 209808349609374 |
| 20 | 1049041748046874 |