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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 51 |
| 4 | 757 |
| 5 | 14058 |
| 6 | 303443 |
| 7 | 7313188 |
| 8 | 192096189 |
| 9 | 5413972155 |
| 10 | 161972306602 |
| 11 | 5104569475976 |
| 12 | 168500227127871 |
| 13 | 5800706769824992 |
| 14 | 207552636468976072 |
| 15 | 7697809237540240440 |
| 16 | 295284422299359774761 |
| 17 | 11693774821978063710405 |