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 | 2 |
| 1 | 6 |
| 2 | 10 |
| 3 | 210 |
| 4 | 22 |
| 5 | 858 |
| 6 | 1870 |
| 7 | 9699690 |
| 8 | 46 |
| 9 | 4002 |
| 10 | 7130 |
| 11 | 160660290 |
| 12 | 20746 |
| 13 | 1008940218 |
| 14 | 2569288370 |
| 15 | 32589158477190044730 |
| 16 | 118 |
| 17 | 21594 |
| 18 | 39530 |
| 19 | 3595293030 |
| 20 | 94754 |
| 21 | 17808161514 |
| 22 | 44788794490 |
| 23 | 7074421030108255253430 |
| 24 | 263258 |
| 25 | 141108130806 |
| 26 | 281595235990 |
| 27 | 296987147493893719182390 |
| 28 | 944729501606 |