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 | 5 |
| 2 | 37 |
| 3 | 269 |
| 4 | 1949 |
| 5 | 14121 |
| 6 | 102313 |
| 7 | 741305 |
| 8 | 5371097 |
| 9 | 38916077 |
| 10 | 281964941 |
| 11 | 2042966149 |
| 12 | 14802232757 |
| 13 | 107249008849 |
| 14 | 777068573905 |
| 15 | 5630220503025 |
| 16 | 40793546383409 |
| 17 | 295568073335893 |
| 18 | 2141527121824885 |
| 19 | 15516352499614333 |
| 20 | 112423136012925517 |
| 21 | 814557513519681785 |