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 | 4 |
| 3 | 8 |
| 4 | 32 |
| 5 | 120 |
| 6 | 464 |
| 7 | 1848 |
| 8 | 7312 |
| 9 | 29240 |
| 10 | 116624 |
| 11 | 466488 |
| 12 | 1864592 |
| 13 | 7458360 |
| 14 | 29827984 |
| 15 | 119311928 |
| 16 | 477225872 |
| 17 | 1908903480 |
| 18 | 7635526544 |
| 19 | 30542106168 |
| 20 | 122168075152 |
| 21 | 488672300600 |
| 22 | 1954687804304 |
| 23 | 7818751217208 |
| 24 | 31274999276432 |
| 25 | 125099997105720 |
| 26 | 500399966053264 |
| 27 | 2001599864213048 |