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 | 720 |
| 2 | 13068 |
| 3 | 118124 |
| 4 | 723680 |
| 5 | 3416930 |
| 6 | 13339535 |
| 7 | 44990231 |
| 8 | 135036473 |
| 9 | 368411615 |
| 10 | 928095740 |
| 11 | 2185031420 |
| 12 | 4853222764 |
| 13 | 10246937272 |
| 14 | 20692933630 |
| 15 | 40171771630 |
| 16 | 75289668850 |
| 17 | 136717357942 |
| 18 | 241276443496 |
| 19 | 414908513800 |
| 20 | 696829576300 |