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) |
|---|---|
| 2 | 1 |
| 3 | 8 |
| 4 | 47 |
| 5 | 248 |
| 6 | 1251 |
| 7 | 6194 |
| 8 | 30496 |
| 9 | 150348 |
| 10 | 745086 |
| 11 | 3719388 |
| 12 | 18721063 |
| 13 | 95045190 |
| 14 | 486669349 |
| 15 | 2512426480 |
| 16 | 13070589618 |
| 17 | 68484870582 |
| 18 | 361191120212 |
| 19 | 1916337714194 |
| 20 | 10222616034264 |
| 21 | 54800827268454 |
| 22 | 295084855980404 |
| 23 | 1595368824989782 |