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 | 3 |
| 2 | 45 |
| 3 | 90 |
| 4 | 180 |
| 5 | 255 |
| 6 | 615 |
| 7 | 705 |
| 8 | 1350 |
| 9 | 1770 |
| 10 | 3225 |
| 11 | 5295 |
| 12 | 5775 |
| 13 | 5955 |
| 14 | 6060 |
| 15 | 8580 |
| 16 | 9855 |
| 17 | 9945 |
| 18 | 11175 |
| 19 | 13095 |
| 20 | 13740 |
| 21 | 15195 |
| 22 | 21825 |
| 23 | 26820 |
| 24 | 26925 |
| 25 | 27615 |
| 26 | 28920 |
| 27 | 30075 |
| 28 | 30705 |
| 29 | 31710 |
| 30 | 33375 |
| 31 | 35700 |
| 32 | 37350 |
| 33 | 37665 |
| 34 | 41250 |
| 35 | 43770 |
| 36 | 49185 |
| 37 | 50700 |
| 38 | 52185 |
| 39 | 53640 |