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 | 340 |
| 2 | 7656 |
| 3 | 23920 |
| 4 | 74248 |
| 5 | 230784 |
| 6 | 721864 |
| 7 | 2263704 |
| 8 | 7152956 |
| 9 | 22522200 |
| 10 | 71566116 |
| 11 | 226074624 |
| 12 | 720236752 |
| 13 | 2280992736 |
| 14 | 7276115664 |
| 15 | 23077516368 |
| 16 | 73669330232 |
| 17 | 233938714232 |
| 18 | 747052012824 |
| 19 | 2374072906440 |
| 20 | 7582196847884 |
| 21 | 24110436293280 |