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 | 9 |
| 3 | 119 |
| 4 | 2662 |
| 5 | 79154 |
| 6 | 2962062 |
| 7 | 132536919 |
| 8 | 6904606698 |
| 9 | 410379198542 |
| 10 | 27406396140548 |
| 11 | 2031843175944876 |
| 12 | 165592123280454675 |
| 13 | 14715292998356150461 |
| 14 | 1416127682894394114138 |
| 15 | 146723247630856311651736 |
| 16 | 16284075762705841850155071 |
| 17 | 1927434528878738556115924081 |
| 18 | 242361176791511465207020367116 |