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 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 0 |
| 13 | 7 |
| 14 | 140 |
| 15 | 840 |
| 16 | 2100 |
| 17 | 2310 |
| 18 | 924 |
| 19 | 0 |
| 20 | 49 |
| 21 | 2156 |
| 22 | 42140 |
| 23 | 479220 |
| 24 | 3598560 |
| 25 | 19184676 |
| 26 | 75954564 |
| 27 | 229873063 |
| 28 | 541427264 |
| 29 | 1002386336 |
| 30 | 1473318476 |
| 31 | 1876489398 |
| 32 | 3785310858 |
| 33 | 20726607804 |
| 34 | 136977861097 |
| 35 | 786065454860 |
| 36 | 3841493284076 |