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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 21 |
| 5 | 83 |
| 6 | 368 |
| 7 | 1814 |
| 8 | 9837 |
| 9 | 58095 |
| 10 | 370499 |
| 11 | 2534374 |
| 12 | 18493023 |
| 13 | 143280489 |
| 14 | 1173971656 |
| 15 | 10136279104 |
| 16 | 91936857611 |
| 17 | 873547634921 |
| 18 | 8673546319685 |
| 19 | 89796095349193 |
| 20 | 967384904147690 |
| 21 | 10825116242427973 |
| 22 | 125613702370667158 |
| 23 | 1509222589338456874 |
| 24 | 18748890945849736182 |