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 | 0 |
| 1 | 1 |
| 2 | 4201 |
| 3 | 94095 |
| 4 | 6758401 |
| 5 | 5265679 |
| 6 | 67166406 |
| 7 | 942574282 |
| 8 | 4281473701 |
| 9 | 1044876843 |
| 10 | 1 |
| 11 | 10642473952 |
| 12 | 42246371916 |
| 13 | 948194858731 |
| 14 | 679456452982 |
| 15 | 526093056675 |
| 16 | 6777261159901 |
| 17 | 9440093995102 |
| 18 | 4266227640753 |
| 19 | 1087526601316 |
| 20 | 4201 |
| 21 | 10287908897661 |
| 22 | 42419722995562 |