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 | 32 |
| 2 | 154 |
| 3 | 578 |
| 4 | 2542 |
| 5 | 11242 |
| 6 | 51004 |
| 7 | 234168 |
| 8 | 1086342 |
| 9 | 5078522 |
| 10 | 23889964 |
| 11 | 112953048 |
| 12 | 536316184 |
| 13 | 2555650688 |
| 14 | 12215701582 |
| 15 | 58545624238 |
| 16 | 281245522518 |
| 17 | 1353858728442 |
| 18 | 6529181968828 |
| 19 | 31539774822672 |
| 20 | 152581524133232 |