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) |
|---|---|
| 3 | 1 |
| 4 | 28 |
| 5 | 586 |
| 6 | 16676 |
| 7 | 674171 |
| 8 | 36729512 |
| 9 | 2591431284 |
| 10 | 229610080632 |
| 11 | 24945009633237 |
| 12 | 3259554588092452 |
| 13 | 504229440385599358 |
| 14 | 91120169013941688700 |
| 15 | 19019291896651737256463 |
| 16 | 4540685283391286195445008 |
| 17 | 1229402290052883559000280168 |
| 18 | 374675876836087520170128786864 |