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 | 4 |
| 3 | 16 |
| 4 | 54 |
| 5 | 168 |
| 6 | 462 |
| 7 | 1212 |
| 8 | 2937 |
| 9 | 6832 |
| 10 | 15135 |
| 11 | 32430 |
| 12 | 66898 |
| 13 | 134710 |
| 14 | 263466 |
| 15 | 504308 |
| 16 | 944208 |
| 17 | 1736575 |
| 18 | 3134832 |
| 19 | 5574947 |
| 20 | 9760954 |
| 21 | 16868418 |
| 22 | 28771587 |
| 23 | 48513127 |
| 24 | 80867486 |
| 25 | 133455462 |
| 26 | 218041708 |
| 27 | 353039664 |
| 28 | 566580113 |
| 29 | 901958971 |
| 30 | 1424480451 |
| 31 | 2233367056 |