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 | 3 |
| 3 | 18 |
| 4 | 138 |
| 5 | 3102 |
| 6 | 137688 |
| 7 | 12617557 |
| 8 | 2402945556 |
| 9 | 936460285557 |
| 10 | 739951660291721 |