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 | 11 |
| 2 | 31 |
| 3 | 151 |
| 4 | 1051 |
| 5 | 10501 |
| 6 | 126001 |
| 7 | 1764001 |
| 8 | 26460001 |
| 9 | 502740001 |
| 10 | 10557540001 |
| 11 | 274496040001 |
| 12 | 7960385160001 |
| 13 | 238811554800001 |
| 14 | 9313650637200001 |
| 15 | 381859676125200001 |
| 16 | 21384141863011200001 |
| 17 | 1325816795506694400001 |