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 | 5 |
| 3 | 22 |
| 4 | 92 |
| 5 | 372 |
| 6 | 1468 |
| 7 | 5688 |
| 8 | 21728 |
| 9 | 82064 |
| 10 | 307088 |
| 11 | 1140320 |
| 12 | 4206912 |
| 13 | 15434048 |
| 14 | 56350912 |
| 15 | 204875648 |
| 16 | 742104064 |
| 17 | 2679197952 |
| 18 | 9644109056 |
| 19 | 34623075840 |
| 20 | 124001176576 |
| 21 | 443136848896 |
| 22 | 1580464036864 |
| 23 | 5626501838848 |
| 24 | 19996918849536 |
| 25 | 70960191213568 |
| 26 | 251445325991936 |