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 | 0 |
| 1 | 0 |
| 2 | 2 |
| 3 | 0 |
| 4 | 2 |
| 5 | 2 |
| 6 | 7 |
| 7 | 5 |
| 8 | 3 |
| 9 | 3 |
| 10 | 3 |
| 11 | 991 |
| 12 | 9001 |
| 13 | 227 |
| 14 | 8291 |
| 15 | 1307 |
| 16 | 209227 |
| 17 | 68742809 |
| 18 | 4023737 |
| 19 | 164510040883 |
| 20 | 24329020081 |
| 21 | 510909421717 |
| 22 | 1240007 |
| 23 | 258520167388849 |
| 24 | 4840173323 |
| 25 | 155112100433309 |
| 26 | 9146112660563 |
| 27 | 694504183521607 |
| 28 | 8344611713860501 |
| 29 | 6199373970195454361 |