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 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 77 |
| 4 | 1002 |
| 5 | 14883 |
| 6 | 239943 |
| 7 | 4087968 |
| 8 | 72533807 |
| 9 | 1327710076 |
| 10 | 24908858009 |
| 11 | 476715857290 |
| 12 | 9275102575355 |
| 13 | 182973889854026 |
| 14 | 3652430836071053 |
| 15 | 73653287861850339 |
| 16 | 1498478743590581081 |
| 17 | 30724985147095051099 |
| 18 | 634350763653787028583 |
| 19 | 13177726323474524612308 |