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 | 3 |
| 3 | 7 |
| 4 | 15 |
| 5 | 24 |
| 6 | 40 |
| 7 | 60 |
| 8 | 120 |
| 9 | 180 |
| 10 | 336 |
| 11 | 360 |
| 12 | 720 |
| 13 | 840 |
| 14 | 1260 |
| 15 | 1440 |
| 16 | 1680 |
| 17 | 2520 |
| 18 | 5040 |
| 19 | 7560 |
| 20 | 10080 |
| 21 | 15120 |
| 22 | 20160 |
| 23 | 25200 |
| 24 | 27720 |
| 25 | 45360 |
| 26 | 50400 |
| 27 | 55440 |
| 28 | 83160 |
| 29 | 110880 |
| 30 | 166320 |
| 31 | 221760 |
| 32 | 277200 |
| 33 | 332640 |
| 34 | 498960 |
| 35 | 554400 |
| 36 | 665280 |
| 37 | 720720 |
| 38 | 1081080 |
| 39 | 1441440 |
| 40 | 2162160 |
| 41 | 2882880 |