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 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 49 |
| 5 | 301 |
| 6 | 1589 |
| 7 | 9761 |
| 8 | 51529 |
| 9 | 452411 |
| 10 | 3041573 |
| 11 | 23140153 |
| 12 | 143573641 |
| 13 | 1260538619 |
| 14 | 8474639717 |
| 15 | 64474684537 |