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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 13 |
| 6 | 77 |
| 7 | 573 |
| 8 | 5143 |
| 9 | 54025 |
| 10 | 650121 |
| 11 | 8817001 |
| 12 | 133049339 |
| 13 | 2210979381 |
| 14 | 40118485237 |
| 15 | 789221836741 |
| 16 | 16730904387183 |
| 17 | 380227386482641 |
| 18 | 9221550336940241 |
| 19 | 237724953543108753 |
| 20 | 6491255423787076915 |
| 21 | 187156557809878784797 |
| 22 | 5681772224922980536413 |