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 | 2 |
| 1 | 13 |
| 2 | 85 |
| 3 | 559 |
| 4 | 3697 |
| 5 | 24583 |
| 6 | 164305 |
| 7 | 1103479 |
| 8 | 7444417 |
| 9 | 50431303 |
| 10 | 342941425 |
| 11 | 2340123799 |
| 12 | 16018069537 |
| 13 | 109949704423 |
| 14 | 756587236945 |
| 15 | 5217746494519 |
| 16 | 36054040477057 |
| 17 | 249557173431943 |
| 18 | 1729973554578865 |
| 19 | 12008254925383639 |