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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 1 |
| 11 | 9 |
| 12 | 53 |
| 13 | 242 |
| 14 | 954 |
| 15 | 3391 |
| 16 | 11220 |
| 17 | 35180 |
| 18 | 105948 |
| 19 | 309175 |
| 20 | 880175 |
| 21 | 2456272 |
| 22 | 6744581 |
| 23 | 18273594 |
| 24 | 48960386 |
| 25 | 129945805 |
| 26 | 342114018 |
| 27 | 894423399 |
| 28 | 2324138696 |
| 29 | 6006737947 |
| 30 | 15450039511 |
| 31 | 39568319805 |
| 32 | 100941888863 |
| 33 | 256597420700 |