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 | 0 |
| 1 | 1 |
| 2 | 15 |
| 3 | 196 |
| 4 | 2535 |
| 5 | 32761 |
| 6 | 423360 |
| 7 | 5470921 |
| 8 | 70698615 |
| 9 | 913611076 |
| 10 | 11806245375 |
| 11 | 152567578801 |
| 12 | 1971572279040 |
| 13 | 25477872048721 |
| 14 | 329240764354335 |
| 15 | 4254652064557636 |
| 16 | 54981236074894935 |
| 17 | 710501416909076521 |