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 | 8 |
| 3 | 36 |
| 4 | 148 |
| 5 | 554 |
| 6 | 2024 |
| 7 | 7134 |
| 8 | 24796 |
| 9 | 84625 |
| 10 | 285784 |
| 11 | 953430 |
| 12 | 3151332 |
| 13 | 10314257 |
| 14 | 33457972 |
| 15 | 107557792 |
| 16 | 342732670 |
| 17 | 1082509680 |
| 18 | 3389190112 |
| 19 | 10518508294 |
| 20 | 32361863632 |