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) |
|---|---|
| 8 | 1 |
| 9 | 98 |
| 10 | 2637 |
| 11 | 44051 |
| 12 | 563444 |
| 13 | 6054955 |
| 14 | 57523592 |
| 15 | 498540949 |
| 16 | 4024955854 |
| 17 | 30719216646 |
| 18 | 224034574434 |
| 19 | 1573966189886 |
| 20 | 10719427410360 |
| 21 | 71119561115093 |
| 22 | 461496506508538 |
| 23 | 2938387657219301 |
| 24 | 18406158143420637 |
| 25 | 113681266064450777 |
| 26 | 693570688210367081 |
| 27 | 4186481577282095644 |