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 | 1 |
| 1 | 19 |
| 2 | 2869 |
| 3 | 84663 |
| 4 | 995241 |
| 5 | 7129227 |
| 6 | 35372141 |
| 7 | 140246303 |
| 8 | 458690081 |
| 9 | 1318315075 |
| 10 | 3375505573 |
| 11 | 7945596055 |
| 12 | 17282877369 |
| 13 | 35516896155 |
| 14 | 68960061837 |
| 15 | 128236319951 |
| 16 | 228701936081 |
| 17 | 394678200083 |
| 18 | 658850300869 |
| 19 | 1072056316615 |