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 | 26 |
| 3 | 451 |
| 4 | 12951 |
| 5 | 551681 |
| 6 | 32512618 |
| 7 | 2525962461 |
| 8 | 249675308081 |
| 9 | 30551602194811 |
| 10 | 4528860725614746 |
| 11 | 799069823975939363 |
| 12 | 165374947602000265231 |
| 13 | 39654053930039468491521 |
| 14 | 10900817711883556591556906 |
| 15 | 3404265715022353551494548021 |
| 16 | 1198175785461867097633422235713 |