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 | 2 |
| 4 | 8 |
| 5 | 32 |
| 6 | 167 |
| 7 | 947 |
| 8 | 6974 |
| 9 | 53426 |
| 10 | 454682 |
| 11 | 4303532 |
| 12 | 50366912 |
| 13 | 553031624 |
| 14 | 6760260236 |
| 15 | 90333982832 |
| 16 | 1369522152392 |
| 17 | 20986020606632 |
| 18 | 350528387240264 |
| 19 | 5751957395258096 |
| 20 | 111685506968916032 |
| 21 | 2139383543480892032 |
| 22 | 41770889787378732752 |
| 23 | 869742098042083451264 |