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 | 4 |
| 2 | 9 |
| 3 | 24 |
| 4 | 47 |
| 5 | 108 |
| 6 | 201 |
| 7 | 424 |
| 8 | 762 |
| 9 | 1538 |
| 10 | 2675 |
| 11 | 5258 |
| 12 | 8915 |
| 13 | 17233 |
| 14 | 28518 |
| 15 | 54636 |
| 16 | 88459 |
| 17 | 169004 |
| 18 | 266670 |
| 19 | 512651 |
| 20 | 786932 |
| 21 | 1530464 |
| 22 | 2270857 |
| 23 | 4516598 |
| 24 | 6439085 |
| 25 | 13207919 |
| 26 | 17852082 |
| 27 | 38438680 |
| 28 | 48640815 |
| 29 | 111440275 |
| 30 | 128688532 |
| 31 | 324010503 |
| 32 | 331752781 |
| 33 | 944134956 |
| 34 | 810982473 |
| 35 | 2781591612 |
| 36 | 1866117373 |
| 37 | 8270004945 |
| 38 | 3647454015 |
| 39 | 25083883563 |
| 40 | 5007776568 |
| 41 | 77130163183 |
| 42 | -6211741855 |