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 | 0 |
| 2 | 3 |
| 3 | 2 |
| 4 | 11 |
| 5 | 14 |
| 6 | 47 |
| 7 | 78 |
| 8 | 217 |
| 9 | 408 |
| 10 | 1039 |
| 11 | 2086 |
| 12 | 5065 |
| 13 | 10560 |
| 14 | 24931 |
| 15 | 53194 |
| 16 | 123403 |
| 17 | 267222 |
| 18 | 612903 |
| 19 | 1340222 |
| 20 | 3050679 |
| 21 | 6714946 |
| 22 | 15205967 |
| 23 | 33622158 |
| 24 | 75864835 |
| 25 | 168275790 |
| 26 | 378743151 |
| 27 | 841959974 |
| 28 | 1891648931 |
| 29 | 4211866694 |
| 30 | 9450828951 |