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 | 28 |
| 2 | 784 |
| 3 | 2654 |
| 4 | 8652 |
| 5 | 33976 |
| 6 | 138552 |
| 7 | 618202 |
| 8 | 2857532 |
| 9 | 13771096 |
| 10 | 67756306 |
| 11 | 339739264 |
| 12 | 1722062016 |
| 13 | 8806555398 |
| 14 | 45292066892 |
| 15 | 233975264688 |
| 16 | 1212420852554 |
| 17 | 6297606134728 |
| 18 | 32768547788112 |
| 19 | 170738390765814 |
| 20 | 890542029961372 |