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 | 69 |
| 3 | 265 |
| 4 | 831 |
| 5 | 9208 |
| 6 | 53608 |
| 7 | 257733 |
| 8 | 1817225 |
| 9 | 11414889 |
| 10 | 65073225 |
| 11 | 412023374 |
| 12 | 2584580914 |
| 13 | 15632039022 |
| 14 | 96988632570 |
| 15 | 604295047829 |
| 16 | 3722359557561 |
| 17 | 23052411911880 |
| 18 | 143185736751014 |
| 19 | 886632358849607 |
| 20 | 5495153241025073 |