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 | 16 |
| 2 | 154 |
| 3 | 1240 |
| 4 | 9202 |
| 5 | 66016 |
| 6 | 466954 |
| 7 | 3283240 |
| 8 | 23026402 |
| 9 | 161316016 |
| 10 | 1129605754 |
| 11 | 7908421240 |
| 12 | 55362491602 |
| 13 | 387548070016 |
| 14 | 2712868376554 |
| 15 | 18990174295240 |
| 16 | 132931507044802 |
| 17 | 930521410248016 |
| 18 | 6513652454539354 |
| 19 | 45595574930185240 |
| 20 | 319169047756526002 |