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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 6 |
| 9 | 26 |
| 10 | 94 |
| 11 | 308 |
| 12 | 935 |
| 13 | 2703 |
| 14 | 7524 |
| 15 | 20375 |
| 16 | 53969 |
| 17 | 140527 |
| 18 | 360733 |
| 19 | 915299 |
| 20 | 2299430 |
| 21 | 5728098 |
| 22 | 14164216 |
| 23 | 34799522 |
| 24 | 85007869 |
| 25 | 206595478 |
| 26 | 499774485 |
| 27 | 1203951992 |
| 28 | 2889243181 |
| 29 | 6909371375 |
| 30 | 16469937376 |
| 31 | 39142669201 |
| 32 | 92769809724 |