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 | 4 |
| 3 | 10 |
| 4 | 23 |
| 5 | 54 |
| 6 | 129 |
| 7 | 307 |
| 8 | 733 |
| 9 | 1757 |
| 10 | 4213 |
| 11 | 10115 |
| 12 | 24315 |
| 13 | 58481 |
| 14 | 140741 |
| 15 | 338890 |
| 16 | 816304 |
| 17 | 1966929 |
| 18 | 4740758 |
| 19 | 11428851 |
| 20 | 27557585 |
| 21 | 66458601 |
| 22 | 160295262 |
| 23 | 386671056 |
| 24 | 932839439 |
| 25 | 2250660384 |
| 26 | 5430575647 |
| 27 | 13104191607 |
| 28 | 31622724351 |
| 29 | 76314992880 |
| 30 | 184178642468 |
| 31 | 444513674334 |
| 32 | 1072865869705 |