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 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 30 |
| 6 | 660 |
| 7 | 810 |
| 8 | 2130 |
| 9 | 2550 |
| 10 | 3330 |
| 11 | 3390 |
| 12 | 5850 |
| 13 | 6270 |
| 14 | 10530 |
| 15 | 33180 |
| 16 | 41610 |
| 17 | 44130 |
| 18 | 53550 |
| 19 | 55440 |
| 20 | 57330 |
| 21 | 63840 |
| 22 | 65100 |
| 23 | 70380 |
| 24 | 70980 |
| 25 | 72270 |
| 26 | 74100 |
| 27 | 74760 |
| 28 | 78780 |
| 29 | 80670 |
| 30 | 81930 |
| 31 | 87540 |
| 32 | 93240 |
| 33 | 102300 |
| 34 | 115470 |
| 35 | 124770 |
| 36 | 133980 |
| 37 | 136950 |
| 38 | 156420 |
| 39 | 161460 |
| 40 | 168450 |