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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 21 |
| 7 | 42 |
| 8 | 97 |
| 9 | 233 |
| 10 | 570 |
| 11 | 1414 |
| 12 | 3319 |
| 13 | 8208 |
| 14 | 20595 |
| 15 | 52370 |
| 16 | 133955 |
| 17 | 328261 |
| 18 | 833652 |
| 19 | 2136155 |
| 20 | 5519116 |
| 21 | 14341917 |
| 22 | 36069212 |
| 23 | 93074465 |
| 24 | 241613666 |
| 25 | 630653714 |
| 26 | 1652472131 |
| 27 | 4215072482 |
| 28 | 10985970447 |
| 29 | 28756470626 |
| 30 | 75580683613 |
| 31 | 199201407564 |
| 32 | 513021407584 |