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 | 6 |
| 2 | 9 |
| 3 | 20 |
| 4 | 40 |
| 5 | 65 |
| 6 | 68 |
| 7 | 96 |
| 8 | 144 |
| 9 | 192 |
| 10 | 528 |
| 11 | 576 |
| 12 | 1028 |
| 13 | 4097 |
| 14 | 73728 |
| 15 | 81920 |
| 16 | 262148 |
| 17 | 557056 |
| 18 | 6291456 |
| 19 | 9437184 |
| 20 | 12582912 |
| 21 | 201326592 |
| 22 | 335544320 |
| 23 | 2415919104 |
| 24 | 1374389534720 |
| 25 | 11258999068426240 |
| 26 | 90071992547409920 |
| 27 | 648518346341351424 |
| 28 | 78398662313265594368 |
| 29 | 116056878683004400771792896 |