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 | 73 |
| 2 | 2628 |
| 3 | 62196 |
| 4 | 1088430 |
| 5 | 15020334 |
| 6 | 170230452 |
| 7 | 1629348612 |
| 8 | 13442126049 |
| 9 | 97082021465 |
| 10 | 621324937376 |
| 11 | 3558497368608 |
| 12 | 18385569737808 |
| 13 | 86270750308176 |
| 14 | 369731787035040 |
| 15 | 1454278362337824 |
| 16 | 5271759063474612 |
| 17 | 17675898036356052 |
| 18 | 54991682779774384 |