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 | 31 |
| 3 | 115 |
| 4 | 5965 |
| 5 | 22261 |
| 6 | 1157131 |
| 7 | 4318471 |
| 8 | 224477401 |
| 9 | 837761065 |
| 10 | 43547458615 |
| 11 | 162521328091 |
| 12 | 8447982493861 |
| 13 | 31528299888541 |
| 14 | 1638865056350371 |
| 15 | 6116327657048815 |
| 16 | 317931372949478065 |
| 17 | 1186536037167581521 |
| 18 | 61677047487142394191 |
| 19 | 230181874882853766211 |