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 | 381 |
| 3 | 6215 |
| 4 | 115773 |
| 5 | 4340367 |
| 6 | 123361724 |
| 7 | 3420197908 |
| 8 | 102189481612 |
| 9 | 2993486726263 |
| 10 | 87036084096735 |
| 11 | 2550795725760992 |
| 12 | 74669036575156557 |
| 13 | 2183108544954393549 |
| 14 | 63879977618932856370 |
| 15 | 1869145222162376267997 |