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 | 2 |
| 3 | 4 |
| 4 | 11 |
| 5 | 18 |
| 6 | 117 |
| 7 | 161 |
| 8 | 1193 |
| 9 | 3530 |
| 10 | 27569 |
| 11 | 60333 |
| 12 | 863409 |
| 13 | 1636609 |
| 14 | 19122031 |
| 15 | 84580125 |
| 16 | 501915567 |
| 17 | 1492170609 |
| 18 | 23751685183 |
| 19 | 47340359591 |
| 20 | 637742820401 |
| 21 | 2546703019245 |
| 22 | 18317620839483 |
| 23 | 49923584451715 |