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) |
|---|---|
| 29 | 1 |
| 30 | 30 |
| 31 | 465 |
| 32 | 4960 |
| 33 | 40920 |
| 34 | 278256 |
| 35 | 1623160 |
| 36 | 8347680 |
| 37 | 38608020 |
| 38 | 163011640 |
| 39 | 635745396 |
| 40 | 2311801440 |
| 41 | 7898654920 |
| 42 | 25518731280 |
| 43 | 78378960360 |
| 44 | 229911617056 |
| 45 | 646626422970 |
| 46 | 1749695026860 |
| 47 | 4568648125690 |
| 48 | 11541847896480 |
| 49 | 28277527346376 |
| 50 | 67327446062800 |
| 51 | 156077261327400 |