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 | 128 |
| 1 | 448 |
| 2 | 1408 |
| 3 | 5056 |
| 4 | 15232 |
| 5 | 56384 |
| 6 | 169216 |
| 7 | 677120 |
| 8 | 2902784 |
| 9 | 12008192 |
| 10 | 49750016 |
| 11 | 323383296 |
| 12 | 2048106496 |
| 13 | 13312700416 |
| 14 | 79908855808 |
| 15 | 520115646464 |
| 16 | 3120693882880 |
| 17 | 19851642843136 |
| 18 | 121321447460864 |
| 19 | 754017659596800 |
| 20 | 5330629212856320 |
| 21 | 37592273278603264 |
| 22 | 230970707522453504 |
| 23 | 1736195064174952448 |
| 24 | 12244744136813133824 |