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 | 34 |
| 4 | 281 |
| 5 | 1397 |
| 6 | 5353 |
| 7 | 17643 |
| 8 | 53062 |
| 9 | 150833 |
| 10 | 414210 |
| 11 | 1114160 |
| 12 | 2960806 |
| 13 | 7814074 |
| 14 | 20544191 |
| 15 | 53902532 |
| 16 | 141273663 |
| 17 | 370060623 |
| 18 | 969088727 |
| 19 | 2537431693 |
| 20 | 6643486220 |
| 21 | 17393369595 |
| 22 | 45537037936 |
| 23 | 119218243314 |
| 24 | 312118286876 |
| 25 | 817137321092 |
| 26 | 2139294503373 |
| 27 | 5600747154678 |