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 | 8 |
| 3 | 54 |
| 4 | 352 |
| 5 | 2276 |
| 6 | 14688 |
| 7 | 94744 |
| 8 | 611072 |
| 9 | 3941136 |
| 10 | 25418368 |
| 11 | 163935584 |
| 12 | 1057300992 |
| 13 | 6819052096 |
| 14 | 43979406848 |
| 15 | 283644733824 |
| 16 | 1829363802112 |
| 17 | 11798463078656 |
| 18 | 76094066608128 |
| 19 | 490767902078464 |
| 20 | 3165202550546432 |