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 | 14 |
| 4 | 43 |
| 5 | 140 |
| 6 | 476 |
| 7 | 1664 |
| 8 | 5939 |
| 9 | 21518 |
| 10 | 78876 |
| 11 | 291784 |
| 12 | 1087441 |
| 13 | 4077662 |
| 14 | 15369327 |
| 15 | 58184110 |
| 16 | 221104527 |
| 17 | 842990294 |
| 18 | 3223339023 |