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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 4 |
| 7 | 8 |
| 8 | 16 |
| 9 | 33 |
| 10 | 73 |
| 11 | 177 |
| 12 | 467 |
| 13 | 1309 |
| 14 | 3813 |
| 15 | 11409 |
| 16 | 34999 |
| 17 | 110510 |
| 18 | 361194 |
| 19 | 1226930 |
| 20 | 4334048 |
| 21 | 15877297 |
| 22 | 60049447 |
| 23 | 233426007 |
| 24 | 929616461 |
| 25 | 3786970033 |
| 26 | 15777120457 |
| 27 | 67260334185 |
| 28 | 293617319221 |
| 29 | 1312868943154 |
| 30 | 6010792180952 |