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 | 1 |
| 2 | 7 |
| 3 | 31 |
| 4 | 127 |
| 5 | 73 |
| 6 | 1414477 |
| 7 | 8191 |
| 8 | 16931177 |
| 9 | 5749691557 |
| 10 | 91546277357 |
| 11 | 3324754717 |
| 12 | 1982765468311237 |
| 13 | 22076500342261 |
| 14 | 65053034220152267 |
| 15 | 925118910976041358111 |
| 16 | 16555640865486520478399 |
| 17 | 8089941578146657681 |
| 18 | 29167285342563717499865628061 |