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 | 1 |
| 2 | 25 |
| 3 | 90 |
| 4 | 585 |
| 5 | 1575 |
| 6 | 2475 |
| 7 | 5850 |
| 8 | 9945 |
| 9 | 16380 |
| 10 | 20475 |
| 11 | 36855 |
| 12 | 45045 |
| 13 | 69615 |
| 14 | 122850 |
| 15 | 135135 |
| 16 | 176715 |
| 17 | 218295 |
| 18 | 225225 |
| 19 | 495495 |
| 20 | 405405 |
| 21 | 348075 |
| 22 | 696150 |
| 23 | 675675 |
| 24 | 765765 |
| 25 | 1461915 |
| 26 | 1351350 |
| 27 | 2304225 |
| 28 | 1576575 |
| 29 | 4037670 |
| 30 | 2027025 |
| 31 | 2837835 |
| 32 | 2297295 |
| 33 | 4542615 |
| 34 | 4594590 |
| 35 | 5135130 |
| 36 | 3828825 |
| 37 | 6912675 |
| 38 | 5360355 |
| 39 | 8558550 |