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 | 12 |
| 3 | 155 |
| 4 | 2128 |
| 5 | 30276 |
| 6 | 440484 |
| 7 | 6506786 |
| 8 | 97181760 |
| 9 | 1463609356 |
| 10 | 22187304112 |
| 11 | 338118529539 |
| 12 | 5175023913008 |
| 13 | 79492847013100 |
| 14 | 1224838471521240 |
| 15 | 18922450356489780 |
| 16 | 293003808610433280 |
| 17 | 4546150487318508156 |
| 18 | 70662280030419277200 |
| 19 | 1100069396653853657564 |