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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 25 |
| 6 | 80 |
| 7 | 267 |
| 8 | 911 |
| 9 | 3170 |
| 10 | 11192 |
| 11 | 39993 |
| 12 | 144320 |
| 13 | 525124 |
| 14 | 1924196 |
| 15 | 7093603 |
| 16 | 26288928 |
| 17 | 97878831 |
| 18 | 365918064 |
| 19 | 1372982706 |
| 20 | 5168555770 |
| 21 | 19514482964 |
| 22 | 73876936272 |
| 23 | 280363191353 |
| 24 | 1066357904128 |
| 25 | 4064204607372 |