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 | 2 |
| 2 | 6 |
| 3 | 50 |
| 4 | 64130 |
| 5 | 800046 |
| 6 | 137270954 |
| 7 | 1860277042 |
| 8 | 357975249026 |
| 9 | 1036802293087622 |
| 10 | 15013817846943906 |
| 11 | 47192717955016924590 |
| 12 | 10360599532897359064118 |
| 13 | 154361699651715243559786 |