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 | 1 |
| 1 | 15 |
| 2 | 157 |
| 3 | 1419 |
| 4 | 11869 |
| 5 | 94731 |
| 6 | 733069 |
| 7 | 5551323 |
| 8 | 41378557 |
| 9 | 304766187 |
| 10 | 2224062061 |
| 11 | 16112628987 |
| 12 | 116053574365 |
| 13 | 831966057483 |
| 14 | 5941308640333 |
| 15 | 42294437942811 |
| 16 | 300292730428093 |
| 17 | 2127439102098219 |
| 18 | 15044413649559085 |