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 | 1 |
| 2 | 4 |
| 3 | 6 |
| 4 | 16 |
| 5 | 20 |
| 6 | 48 |
| 7 | 70 |
| 8 | 160 |
| 9 | 270 |
| 10 | 560 |
| 11 | 1034 |
| 12 | 2160 |
| 13 | 4108 |
| 14 | 8344 |
| 15 | 16440 |
| 16 | 33088 |
| 17 | 65552 |
| 18 | 131688 |
| 19 | 262162 |
| 20 | 525440 |
| 21 | 1048740 |
| 22 | 2099240 |
| 23 | 4194326 |
| 24 | 8393184 |
| 25 | 16777300 |
| 26 | 33562672 |
| 27 | 67109418 |
| 28 | 134234464 |
| 29 | 268435484 |
| 30 | 536904960 |
| 31 | 1073741854 |
| 32 | 2147549824 |
| 33 | 4294969404 |