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 | 390 |
| 2 | 7800 |
| 3 | 48870 |
| 4 | 164470 |
| 5 | 430840 |
| 6 | 900890 |
| 7 | 1735800 |
| 8 | 2982660 |
| 9 | 4849740 |
| 10 | 7438490 |
| 11 | 11017860 |
| 12 | 15596420 |
| 13 | 21713060 |
| 14 | 29254830 |
| 15 | 38714410 |
| 16 | 50238450 |
| 17 | 64311090 |
| 18 | 80839300 |
| 19 | 100786890 |
| 20 | 123786030 |
| 21 | 150835530 |