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 | 4 |
| 2 | 31 |
| 3 | 352 |
| 4 | 5233 |
| 5 | 95836 |
| 6 | 2080999 |
| 7 | 52189096 |
| 8 | 1482977857 |
| 9 | 47053929268 |
| 10 | 1648037039791 |
| 11 | 63125834205424 |
| 12 | 2624096058047281 |
| 13 | 117620219281363852 |
| 14 | 5653607876781921463 |
| 15 | 290035426344483253816 |
| 16 | 15814774125898034896129 |