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 | 2 |
| 2 | 8 |
| 3 | 16 |
| 4 | 36 |
| 5 | 112 |
| 6 | 256 |
| 7 | 608 |
| 8 | 1680 |
| 9 | 4064 |
| 10 | 9920 |
| 11 | 25984 |
| 12 | 64320 |
| 13 | 159232 |
| 14 | 407296 |
| 15 | 1017344 |
| 16 | 2536704 |
| 17 | 6420992 |
| 18 | 16093184 |
| 19 | 40271872 |
| 20 | 101471232 |
| 21 | 254636032 |
| 22 | 638328832 |
| 23 | 1605165056 |
| 24 | 4029763584 |
| 25 | 10110525440 |
| 26 | 25402425344 |
| 27 | 63780978688 |
| 28 | 160088997888 |