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) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 0 |
| 4 | 3 |
| 5 | 0 |
| 6 | 3 |
| 7 | 6 |
| 8 | 23 |
| 9 | 68 |
| 10 | 205 |
| 11 | 572 |
| 12 | 1553 |
| 13 | 4208 |
| 14 | 11405 |
| 15 | 30988 |
| 16 | 84553 |
| 17 | 231176 |
| 18 | 632915 |
| 19 | 1734004 |
| 20 | 4751591 |
| 21 | 13021550 |
| 22 | 35685855 |
| 23 | 97797264 |
| 24 | 268015939 |
| 25 | 734511376 |
| 26 | 2012982445 |
| 27 | 5516772882 |
| 28 | 15119337301 |
| 29 | 41436399090 |
| 30 | 113561805901 |
| 31 | 311231201784 |