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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 29 |
| 6 | 43 |
| 7 | 69 |
| 8 | 1879 |
| 9 | 2287 |
| 10 | 3780 |
| 11 | 4200 |
| 12 | 4440 |
| 13 | 4620 |
| 14 | 5040 |
| 15 | 6300 |
| 16 | 7140 |
| 17 | 7560 |
| 18 | 8820 |
| 19 | 9240 |
| 20 | 10080 |
| 21 | 12600 |
| 22 | 13860 |
| 23 | 15120 |
| 24 | 17640 |
| 25 | 18480 |
| 26 | 20160 |
| 27 | 22680 |
| 28 | 25200 |
| 29 | 27720 |
| 30 | 28560 |
| 31 | 30240 |
| 32 | 32760 |
| 33 | 37800 |
| 34 | 42840 |
| 35 | 50400 |
| 36 | 55440 |
| 37 | 57960 |
| 38 | 60480 |
| 39 | 64680 |
| 40 | 65520 |
| 41 | 73080 |
| 42 | 75600 |