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) |
|---|---|
| 0 | 0 |
| 1 | 420 |
| 2 | 840 |
| 3 | 1260 |
| 4 | 1680 |
| 5 | 2100 |
| 6 | 2520 |
| 7 | 2940 |
| 8 | 3360 |
| 9 | 3780 |
| 10 | 4200 |
| 11 | 4620 |
| 12 | 5040 |
| 13 | 5460 |
| 14 | 5880 |
| 15 | 6300 |
| 16 | 6720 |
| 17 | 7140 |
| 18 | 7560 |
| 19 | 7980 |
| 20 | 8400 |
| 21 | 8820 |
| 22 | 9240 |
| 23 | 9660 |
| 24 | 10080 |
| 25 | 10500 |
| 26 | 10920 |
| 27 | 11340 |
| 28 | 11760 |
| 29 | 12180 |
| 30 | 12600 |
| 31 | 13020 |
| 32 | 13440 |
| 33 | 13860 |
| 34 | 14280 |
| 35 | 14700 |
| 36 | 15120 |
| 37 | 15540 |
| 38 | 15960 |
| 39 | 16380 |
| 40 | 16800 |