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 | 4 |
| 4 | 8 |
| 5 | 20 |
| 6 | 40 |
| 7 | 88 |
| 8 | 176 |
| 9 | 364 |
| 10 | 728 |
| 11 | 1480 |
| 12 | 2960 |
| 13 | 5960 |
| 14 | 11920 |
| 15 | 23920 |
| 16 | 47840 |
| 17 | 95828 |
| 18 | 191656 |
| 19 | 383608 |
| 20 | 767216 |
| 21 | 1535000 |
| 22 | 3070000 |
| 23 | 6141136 |
| 24 | 12282272 |
| 25 | 24566776 |
| 26 | 49133552 |
| 27 | 98271568 |
| 28 | 196543136 |
| 29 | 393095120 |
| 30 | 786190240 |
| 31 | 1572398176 |
| 32 | 3144796352 |
| 33 | 6289627948 |
| 34 | 12579255896 |