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) |
|---|---|
| 2 | 0 |
| 3 | 18 |
| 4 | 108 |
| 5 | 270 |
| 6 | 504 |
| 7 | 810 |
| 8 | 1188 |
| 9 | 1638 |
| 10 | 2160 |
| 11 | 2754 |
| 12 | 3420 |
| 13 | 4158 |
| 14 | 4968 |
| 15 | 5850 |
| 16 | 6804 |
| 17 | 7830 |
| 18 | 8928 |
| 19 | 10098 |
| 20 | 11340 |
| 21 | 12654 |
| 22 | 14040 |
| 23 | 15498 |
| 24 | 17028 |
| 25 | 18630 |
| 26 | 20304 |
| 27 | 22050 |
| 28 | 23868 |
| 29 | 25758 |
| 30 | 27720 |
| 31 | 29754 |
| 32 | 31860 |
| 33 | 34038 |
| 34 | 36288 |
| 35 | 38610 |
| 36 | 41004 |
| 37 | 43470 |
| 38 | 46008 |
| 39 | 48618 |
| 40 | 51300 |
| 41 | 54054 |
| 42 | 56880 |
| 43 | 59778 |