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 | 16 |
| 2 | 155 |
| 3 | 1633 |
| 4 | 19714 |
| 5 | 272501 |
| 6 | 4269271 |
| 7 | 74971240 |
| 8 | 1460701853 |
| 9 | 31295474659 |
| 10 | 731658123646 |
| 11 | 18541725927671 |
| 12 | 506405138998225 |
| 13 | 14830681754924608 |
| 14 | 463675143369795659 |
| 15 | 15415347314972132761 |
| 16 | 543080592733655070466 |
| 17 | 20211128647048824421085 |
| 18 | 792340775489805581958823 |