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 | 0 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 4 |
| 9 | 4 |
| 10 | 9 |
| 11 | 16 |
| 12 | 25 |
| 13 | 49 |
| 14 | 81 |
| 15 | 144 |
| 16 | 256 |
| 17 | 441 |
| 18 | 784 |
| 19 | 1369 |
| 20 | 2401 |
| 21 | 4225 |
| 22 | 7396 |
| 23 | 12996 |
| 24 | 22801 |
| 25 | 40000 |
| 26 | 70225 |
| 27 | 123201 |
| 28 | 216225 |
| 29 | 379456 |
| 30 | 665856 |
| 31 | 1168561 |
| 32 | 2050624 |
| 33 | 3598609 |
| 34 | 6315169 |
| 35 | 11082241 |
| 36 | 19448100 |
| 37 | 34128964 |
| 38 | 59892121 |
| 39 | 105103504 |
| 40 | 184443561 |
| 41 | 323676081 |