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 | 0 |
| 2 | 16 |
| 3 | 194 |
| 4 | 1932 |
| 5 | 18181 |
| 6 | 168330 |
| 7 | 1555366 |
| 8 | 14424896 |
| 9 | 134429269 |
| 10 | 1258812629 |
| 11 | 11840308472 |
| 12 | 111817802539 |
| 13 | 1059796159358 |
| 14 | 10076977878935 |
| 15 | 96091981692305 |
| 16 | 918679869869451 |
| 17 | 8803388128870716 |
| 18 | 84537081067757934 |
| 19 | 813340036390023775 |
| 20 | 7838825925395981969 |
| 21 | 75669246174605279757 |