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 | 1 |
| 2 | 4 |
| 3 | 12 |
| 4 | 37 |
| 5 | 114 |
| 6 | 351 |
| 7 | 1081 |
| 8 | 3329 |
| 9 | 10252 |
| 10 | 31572 |
| 11 | 97229 |
| 12 | 299426 |
| 13 | 922111 |
| 14 | 2839729 |
| 15 | 8745217 |
| 16 | 26931732 |
| 17 | 82938844 |
| 18 | 255418101 |
| 19 | 786584466 |
| 20 | 2422362079 |
| 21 | 7459895657 |
| 22 | 22973462017 |
| 23 | 70748973084 |
| 24 | 217878227876 |
| 25 | 670976837021 |
| 26 | 2066337330754 |