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 | 6 |
| 5 | 16 |
| 6 | 49 |
| 7 | 129 |
| 8 | 481 |
| 9 | 1845 |
| 10 | 9506 |
| 11 | 57896 |
| 12 | 463909 |
| 13 | 4769436 |
| 14 | 65179170 |
| 15 | 1187099045 |
| 16 | 29082860878 |
| 17 | 960963147303 |
| 18 | 42920936851975 |
| 19 | 2594399793419459 |
| 20 | 212465886865393053 |
| 21 | 23596018831885668391 |
| 22 | 3557502387712889568013 |
| 23 | 728850489548729072323085 |