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 | 141 |
| 4 | 517 |
| 5 | 1089 |
| 6 | 1621 |
| 7 | 1651 |
| 8 | 2359 |
| 9 | 17529 |
| 10 | 20086 |
| 11 | 124282 |
| 12 | 1664338 |
| 13 | 72452549 |
| 14 | 1503846167 |
| 15 | 14457164981 |
| 16 | 17107594211 |
| 17 | 17458514913 |
| 18 | 24556027479 |