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 | 7 |
| 5 | 7 |
| 6 | 1 |
| 7 | 1 |
| 8 | 20 |
| 9 | 75 |
| 10 | 75 |
| 11 | 20 |
| 12 | 1 |
| 13 | 1 |
| 14 | 42 |
| 15 | 364 |
| 16 | 1001 |
| 17 | 1001 |
| 18 | 364 |
| 19 | 42 |
| 20 | 1 |
| 21 | 1 |
| 22 | 75 |
| 23 | 1212 |
| 24 | 6720 |
| 25 | 15288 |
| 26 | 15288 |
| 27 | 6720 |
| 28 | 1212 |
| 29 | 75 |
| 30 | 1 |
| 31 | 1 |
| 32 | 121 |
| 33 | 3223 |
| 34 | 30723 |
| 35 | 127908 |
| 36 | 255816 |
| 37 | 255816 |
| 38 | 127908 |
| 39 | 30723 |
| 40 | 3223 |
| 41 | 121 |
| 42 | 1 |
| 43 | 1 |
| 44 | 182 |
| 45 | 7371 |
| 46 | 109538 |
| 47 | 737737 |
| 48 | 2510508 |