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 | 1 |
| 4 | 4 |
| 5 | 1 |
| 6 | 1 |
| 7 | 6 |
| 8 | 18 |
| 9 | 1 |
| 10 | 1 |
| 11 | 8 |
| 12 | 36 |
| 13 | 104 |
| 14 | 1 |
| 15 | 1 |
| 16 | 10 |
| 17 | 60 |
| 18 | 260 |
| 19 | 750 |
| 20 | 1 |
| 21 | 1 |
| 22 | 12 |
| 23 | 90 |
| 24 | 520 |
| 25 | 2250 |
| 26 | 6492 |
| 27 | 1 |
| 28 | 1 |
| 29 | 14 |
| 30 | 126 |
| 31 | 910 |
| 32 | 5250 |
| 33 | 22722 |
| 34 | 65562 |
| 35 | 1 |
| 36 | 1 |
| 37 | 16 |
| 38 | 168 |
| 39 | 1456 |
| 40 | 10500 |
| 41 | 60592 |
| 42 | 262248 |
| 43 | 756688 |
| 44 | 1 |
| 45 | 1 |
| 46 | 18 |
| 47 | 216 |
| 48 | 2184 |
| 49 | 18900 |
| 50 | 136332 |
| 51 | 786744 |
| 52 | 3405096 |
| 53 | 9825030 |
| 54 | 1 |