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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 3 |
| 7 | 8 |
| 8 | 18 |
| 9 | 40 |
| 10 | 87 |
| 11 | 191 |
| 12 | 400 |
| 13 | 855 |
| 14 | 1776 |
| 15 | 3697 |
| 16 | 7644 |
| 17 | 15752 |
| 18 | 32365 |
| 19 | 66304 |
| 20 | 135570 |
| 21 | 276590 |
| 22 | 563432 |
| 23 | 1146045 |
| 24 | 2328063 |
| 25 | 4724270 |
| 26 | 9577176 |
| 27 | 19397428 |
| 28 | 39256129 |
| 29 | 79390449 |
| 30 | 160450210 |
| 31 | 324088695 |
| 32 | 654261484 |