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 | 12 |
| 3 | 52 |
| 4 | 186 |
| 5 | 1045 |
| 6 | 5685 |
| 7 | 28565 |
| 8 | 148681 |
| 9 | 783104 |
| 10 | 4082179 |
| 11 | 21289432 |
| 12 | 111293510 |
| 13 | 581390557 |
| 14 | 3036127779 |
| 15 | 15859365566 |
| 16 | 82842802213 |
| 17 | 432710054944 |
| 18 | 2260195540670 |
| 19 | 11805906967573 |
| 20 | 61666590418664 |
| 21 | 322107101630217 |
| 22 | 1682485627292574 |