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 | 4 |
| 3 | 11 |
| 4 | 30 |
| 5 | 83 |
| 6 | 236 |
| 7 | 687 |
| 8 | 2026 |
| 9 | 6027 |
| 10 | 18008 |
| 11 | 53927 |
| 12 | 161654 |
| 13 | 484803 |
| 14 | 1454212 |
| 15 | 4362399 |
| 16 | 13086914 |
| 17 | 39260411 |
| 18 | 117780848 |
| 19 | 353342103 |
| 20 | 1060025806 |
| 21 | 3180076851 |
| 22 | 9540229916 |
| 23 | 28620689039 |
| 24 | 85862066330 |
| 25 | 257586198123 |
| 26 | 772758593416 |
| 27 | 2318275779207 |
| 28 | 6954827336486 |
| 29 | 20864482008227 |
| 30 | 62593446023348 |
| 31 | 187780338068607 |
| 32 | 563341014204274 |
| 33 | 1690023042611163 |