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 | 6 |
| 2 | 51 |
| 3 | 651 |
| 4 | 13131 |
| 5 | 435801 |
| 6 | 24530016 |
| 7 | 2394413286 |
| 8 | 412135908606 |
| 9 | 126722253316281 |
| 10 | 70336222713070656 |
| 11 | 71088278975389204986 |
| 12 | 131802456226253519662956 |
| 13 | 451158681817567800972000111 |