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) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 18 |
| 4 | 68 |
| 5 | 250 |
| 6 | 922 |
| 7 | 1029 |
| 8 | 580 |
| 9 | 2691 |
| 10 | 4754 |
| 11 | 2662 |
| 12 | 8474 |
| 13 | 4394 |
| 14 | 10294 |
| 15 | 2518 |
| 16 | 49732 |
| 17 | 29478 |
| 18 | 65074 |
| 19 | 123462 |
| 20 | 128818 |
| 21 | 6535 |
| 22 | 93174 |
| 23 | 36501 |
| 24 | 12058 |
| 25 | 187750 |
| 26 | 162582 |
| 27 | 297936 |
| 28 | 273782 |
| 29 | 536558 |
| 30 | 741422 |
| 31 | 59582 |
| 32 | 16964 |
| 33 | 118477 |
| 34 | 540434 |
| 35 | 132305 |
| 36 | 136130 |
| 37 | 1114366 |
| 38 | 1138598 |
| 39 | 2214594 |
| 40 | 2381618 |
| 41 | 1860867 |
| 42 | 2795686 |
| 43 | 1828661 |
| 44 | 1775622 |
| 45 | 2683618 |
| 46 | 1435710 |
| 47 | 1557345 |
| 48 | 3882778 |