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 | 2 |
| 2 | 5 |
| 3 | 10 |
| 4 | 21 |
| 5 | 44 |
| 6 | 93 |
| 7 | 196 |
| 8 | 411 |
| 9 | 856 |
| 10 | 1771 |
| 11 | 3642 |
| 12 | 7451 |
| 13 | 15178 |
| 14 | 30809 |
| 15 | 62358 |
| 16 | 125921 |
| 17 | 253800 |
| 18 | 510777 |
| 19 | 1026704 |
| 20 | 2061751 |
| 21 | 4137012 |
| 22 | 8295895 |
| 23 | 16627190 |
| 24 | 33311671 |
| 25 | 66716054 |
| 26 | 133582133 |
| 27 | 267407026 |
| 28 | 535206861 |
| 29 | 1071049316 |
| 30 | 2143127061 |
| 31 | 4287918172 |
| 32 | 8578528851 |
| 33 | 17161414288 |