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 | 5 |
| 2 | 29 |
| 3 | 189 |
| 4 | 1357 |
| 5 | 10589 |
| 6 | 88909 |
| 7 | 797085 |
| 8 | 7583373 |
| 9 | 76179037 |
| 10 | 804638925 |
| 11 | 8904557341 |
| 12 | 102929260813 |
| 13 | 1239432543709 |
| 14 | 15511264432973 |
| 15 | 201330839371421 |
| 16 | 2705249923950477 |
| 17 | 37567754666530141 |
| 18 | 538369104335121869 |