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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 79 |
| 4 | 2101 |
| 5 | 63991 |
| 6 | 1841461 |
| 7 | 45677479 |
| 8 | 986583781 |
| 9 | 19210969591 |
| 10 | 347527345621 |
| 11 | 5968468471879 |
| 12 | 98788140462661 |
| 13 | 1592387628858391 |
| 14 | 25181074712937781 |
| 15 | 392680081411090279 |
| 16 | 6061279724768728741 |
| 17 | 92859536016650958391 |
| 18 | 1414764491802643937941 |