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) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 6 |
| 4 | 24 |
| 5 | 30 |
| 6 | 84 |
| 7 | 126 |
| 8 | 288 |
| 9 | 522 |
| 10 | 1080 |
| 11 | 2046 |
| 12 | 4224 |
| 13 | 8190 |
| 14 | 16548 |
| 15 | 32850 |
| 16 | 65856 |
| 17 | 131070 |
| 18 | 262836 |
| 19 | 524286 |
| 20 | 1049760 |
| 21 | 2097438 |
| 22 | 4196412 |
| 23 | 8388606 |
| 24 | 16782048 |
| 25 | 33554550 |
| 26 | 67117128 |
| 27 | 134218782 |
| 28 | 268452240 |
| 29 | 536870910 |
| 30 | 1073777040 |
| 31 | 2147483646 |
| 32 | 4295033472 |
| 33 | 8589938742 |
| 34 | 17180000352 |
| 35 | 34359739050 |