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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 18 |
| 6 | 36 |
| 7 | 54 |
| 8 | 72 |
| 9 | 180 |
| 10 | 378 |
| 11 | 576 |
| 12 | 774 |
| 13 | 972 |
| 14 | 2970 |
| 15 | 4968 |
| 16 | 6966 |
| 17 | 8964 |
| 18 | 19962 |
| 19 | 39960 |
| 20 | 59958 |
| 21 | 79956 |
| 22 | 99954 |
| 23 | 299952 |
| 24 | 499950 |
| 25 | 699948 |
| 26 | 899946 |
| 27 | 1999944 |
| 28 | 3999942 |
| 29 | 5999940 |
| 30 | 7999938 |
| 31 | 9999936 |
| 32 | 29999934 |
| 33 | 49999932 |
| 34 | 69999930 |
| 35 | 89999928 |
| 36 | 199999926 |
| 37 | 399999924 |
| 38 | 599999922 |