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 | 3 |
| 3 | 11 |
| 4 | 43 |
| 5 | 187 |
| 6 | 857 |
| 7 | 4144 |
| 8 | 20812 |
| 9 | 107822 |
| 10 | 572918 |
| 11 | 3108512 |
| 12 | 17164308 |
| 13 | 96199106 |
| 14 | 546137465 |
| 15 | 3135381256 |
| 16 | 18177991951 |