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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 14 |
| 4 | 72 |
| 5 | 257 |
| 6 | 873 |
| 7 | 2838 |
| 8 | 9085 |
| 9 | 28979 |
| 10 | 92145 |
| 11 | 292832 |
| 12 | 930124 |
| 13 | 2953569 |
| 14 | 9376798 |
| 15 | 29760901 |
| 16 | 94434276 |
| 17 | 299569798 |
| 18 | 950072891 |
| 19 | 3012393832 |
| 20 | 9549260877 |
| 21 | 30264906899 |
| 22 | 95902117819 |
| 23 | 303839485659 |
| 24 | 962486295193 |
| 25 | 3048497625289 |
| 26 | 9654373954803 |
| 27 | 30571355398031 |
| 28 | 96797106918709 |