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 | 9 |
| 3 | 46 |
| 4 | 184 |
| 5 | 640 |
| 6 | 2032 |
| 7 | 6048 |
| 8 | 17152 |
| 9 | 46848 |
| 10 | 124160 |
| 11 | 321024 |
| 12 | 813056 |
| 13 | 2023424 |
| 14 | 4960256 |
| 15 | 12001280 |
| 16 | 28704768 |
| 17 | 67960832 |
| 18 | 159449088 |
| 19 | 371064832 |
| 20 | 857210880 |
| 21 | 1967128576 |
| 22 | 4486856704 |
| 23 | 10177478656 |
| 24 | 22968008704 |
| 25 | 51589939200 |
| 26 | 115376914432 |