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 | 3 |
| 3 | 84 |
| 4 | 17550 |
| 5 | 25621596 |
| 6 | 268715232324 |
| 7 | 21091830512086620 |
| 8 | 12814543323816738705045 |
| 9 | 61742372998425082372103866380 |
| 10 | 2399699340005498870742886195375900380 |
| 11 | 761689137813999393167583510790986701377432464 |
| 12 | 1992997938492157367948224731863936229108552184201415196 |