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 | 20 |
| 2 | 104 |
| 3 | 464 |
| 4 | 650 |
| 5 | 1952 |
| 6 | 130304 |
| 7 | 522752 |
| 8 | 8382464 |
| 9 | 134193152 |
| 10 | 549754241024 |
| 11 | 8796086730752 |
| 12 | 140737463189504 |
| 13 | 144115187270549504 |