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) |
|---|---|
| 4 | 5 |
| 5 | 29 |
| 6 | 179 |
| 7 | 1259 |
| 8 | 10079 |
| 9 | 90719 |
| 10 | 907199 |
| 11 | 9979199 |
| 12 | 119750399 |
| 13 | 1556755199 |
| 14 | 21794572799 |
| 15 | 326918591999 |
| 16 | 5230697471999 |
| 17 | 88921857023999 |
| 18 | 1600593426431999 |
| 19 | 30411275102207999 |
| 20 | 608225502044159999 |