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 | 1 |
| 1 | 4 |
| 2 | 26 |
| 3 | 184 |
| 4 | 1366 |
| 5 | 10424 |
| 6 | 80996 |
| 7 | 637424 |
| 8 | 5064166 |
| 9 | 40528984 |
| 10 | 326251276 |
| 11 | 2638751504 |
| 12 | 21426682876 |
| 13 | 174563719984 |
| 14 | 1426219233416 |
| 15 | 11681133293024 |
| 16 | 95877105146246 |
| 17 | 788433553532824 |
| 18 | 6494463369141116 |
| 19 | 53576199709855184 |