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 | 5 |
| 2 | 71 |
| 3 | 647 |
| 4 | 5183 |
| 5 | 38879 |
| 6 | 279935 |
| 7 | 1959551 |
| 8 | 13436927 |
| 9 | 90699263 |
| 10 | 604661759 |
| 11 | 3990767615 |
| 12 | 26121388031 |
| 13 | 169789022207 |
| 14 | 1097098297343 |
| 15 | 7052774768639 |
| 16 | 45137758519295 |
| 17 | 287753210560511 |
| 18 | 1828079220031487 |
| 19 | 11577835060199423 |
| 20 | 73123168801259519 |
| 21 | 460675963447934975 |
| 22 | 2895677484529876991 |