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 | 3 |
| 2 | 45 |
| 3 | 3402 |
| 4 | 1299078 |
| 5 | 2507870079 |
| 6 | 24487299427734 |
| 7 | 1209640056157393380 |
| 8 | 302358334494179897593596 |
| 9 | 382459771435292361460924379370 |
| 10 | 2448391839613471201062299337071282925 |