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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 4 |
| 8 | 4 |
| 9 | 1 |
| 10 | 13 |
| 11 | 13 |
| 12 | 1 |
| 13 | 40 |
| 14 | 40 |
| 15 | 1 |
| 16 | 121 |
| 17 | 121 |
| 18 | 1 |
| 19 | 364 |
| 20 | 364 |
| 21 | 1 |
| 22 | 1093 |
| 23 | 1093 |
| 24 | 1 |
| 25 | 3280 |
| 26 | 3280 |
| 27 | 1 |
| 28 | 9841 |
| 29 | 9841 |
| 30 | 1 |
| 31 | 29524 |
| 32 | 29524 |
| 33 | 1 |
| 34 | 88573 |
| 35 | 88573 |
| 36 | 1 |
| 37 | 265720 |
| 38 | 265720 |
| 39 | 1 |
| 40 | 797161 |
| 41 | 797161 |
| 42 | 1 |
| 43 | 2391484 |
| 44 | 2391484 |
| 45 | 1 |
| 46 | 7174453 |
| 47 | 7174453 |
| 48 | 1 |
| 49 | 21523360 |
| 50 | 21523360 |
| 51 | 1 |
| 52 | 64570081 |