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 | 3 |
| 3 | 19 |
| 4 | 201 |
| 5 | 3081 |
| 6 | 62683 |
| 7 | 1598955 |
| 8 | 49180113 |
| 9 | 1773405649 |
| 10 | 73410669171 |
| 11 | 3432267261699 |
| 12 | 178922825114905 |
| 13 | 10291053760222041 |
| 14 | 647436905815864011 |
| 15 | 44229766376059342171 |
| 16 | 3260749830852693615777 |
| 17 | 258039101519624535653025 |