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 | 1 |
| 2 | 0 |
| 3 | 4 |
| 4 | 4 |
| 5 | 16 |
| 6 | 32 |
| 7 | 80 |
| 8 | 192 |
| 9 | 448 |
| 10 | 1088 |
| 11 | 2560 |
| 12 | 6144 |
| 13 | 14592 |
| 14 | 34816 |
| 15 | 82944 |
| 16 | 197632 |
| 17 | 471040 |
| 18 | 1122304 |
| 19 | 2674688 |
| 20 | 6373376 |
| 21 | 15187968 |
| 22 | 36192256 |
| 23 | 86245376 |
| 24 | 205520896 |
| 25 | 489750528 |
| 26 | 1167065088 |
| 27 | 2781085696 |
| 28 | 6627262464 |
| 29 | 15792603136 |
| 30 | 37633392640 |