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 | 11 |
| 3 | 547 |
| 4 | 52429 |
| 5 | 8138021 |
| 6 | 1865813431 |
| 7 | 593445188743 |
| 8 | 250199979298361 |
| 9 | 135085171767299209 |
| 10 | 90909090909090909091 |
| 11 | 74619186937936447687211 |
| 12 | 73381705110822317661638341 |
| 13 | 85180949465178001182799643437 |
| 14 | 115244915978498073437814463065839 |
| 15 | 179766618030828831251710653305053711 |