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 | 2 |
| 4 | 4 |
| 5 | 14 |
| 6 | 28 |
| 7 | 74 |
| 8 | 148 |
| 9 | 350 |
| 10 | 700 |
| 11 | 1562 |
| 12 | 3124 |
| 13 | 6734 |
| 14 | 13468 |
| 15 | 28394 |
| 16 | 56788 |
| 17 | 117950 |
| 18 | 235900 |
| 19 | 484922 |
| 20 | 969844 |
| 21 | 1979054 |
| 22 | 3958108 |
| 23 | 8034314 |
| 24 | 16068628 |
| 25 | 32491550 |
| 26 | 64983100 |
| 27 | 131029082 |
| 28 | 262058164 |
| 29 | 527304974 |
| 30 | 1054609948 |
| 31 | 2118785834 |
| 32 | 4237571668 |
| 33 | 8503841150 |
| 34 | 17007682300 |