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 | 6 |
| 3 | 18 |
| 4 | 216 |
| 5 | 42768 |
| 6 | 1819863936 |
| 7 | 3311826913612597248 |
| 8 | 10968197499701667312529793029329125376 |
| 9 | 120301356392461906290006219878693096559247086148184247242087281541542576128 |