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 | 2 |
| 2 | 5 |
| 3 | 12 |
| 4 | 34 |
| 5 | 102 |
| 6 | 374 |
| 7 | 1680 |
| 8 | 10271 |
| 9 | 91878 |
| 10 | 1308856 |
| 11 | 31048616 |
| 12 | 1243411976 |
| 13 | 83446254312 |
| 14 | 9312844044030 |
| 15 | 1715236203607456 |