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 | 2 |
| 2 | 10 |
| 3 | 34 |
| 4 | 98 |
| 5 | 258 |
| 6 | 642 |
| 7 | 1538 |
| 8 | 3586 |
| 9 | 8194 |
| 10 | 18434 |
| 11 | 40962 |
| 12 | 90114 |
| 13 | 196610 |
| 14 | 425986 |
| 15 | 917506 |
| 16 | 1966082 |
| 17 | 4194306 |
| 18 | 8912898 |
| 19 | 18874370 |
| 20 | 39845890 |
| 21 | 83886082 |
| 22 | 176160770 |
| 23 | 369098754 |
| 24 | 771751938 |
| 25 | 1610612738 |
| 26 | 3355443202 |
| 27 | 6979321858 |
| 28 | 14495514626 |
| 29 | 30064771074 |
| 30 | 62277025794 |