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 | 1 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 6 |
| 12 | 84 |
| 13 | 336 |
| 14 | 504 |
| 15 | 252 |
| 16 | 0 |
| 17 | 36 |
| 18 | 1134 |
| 19 | 15960 |
| 20 | 130536 |
| 21 | 700560 |
| 22 | 2639952 |
| 23 | 7260840 |
| 24 | 14894712 |
| 25 | 23151996 |
| 26 | 29957760 |
| 27 | 60579792 |
| 28 | 319505760 |
| 29 | 1930565232 |
| 30 | 9852185196 |
| 31 | 41993000532 |
| 32 | 151747572312 |
| 33 | 471322972512 |
| 34 | 1275430904496 |
| 35 | 3072333948480 |