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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 27 |
| 5 | 89 |
| 6 | 272 |
| 7 | 873 |
| 8 | 2859 |
| 9 | 8936 |
| 10 | 25491 |
| 11 | 67665 |
| 12 | 228192 |
| 13 | 752241 |
| 14 | 2167859 |
| 15 | 6833896 |
| 16 | 18464907 |
| 17 | 52758345 |
| 18 | 142005584 |
| 19 | 440498361 |
| 20 | 1186119547 |
| 21 | 3461957320 |
| 22 | 9357060899 |
| 23 | 26968655777 |
| 24 | 72945663424 |
| 25 | 226371206881 |
| 26 | 613739200867 |
| 27 | 1752444795592 |
| 28 | 4702791627067 |
| 29 | 14623717009785 |