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) |
|---|---|
| 3 | 4 |
| 4 | 11 |
| 5 | 36 |
| 6 | 148 |
| 7 | 758 |
| 8 | 4640 |
| 9 | 33018 |
| 10 | 267716 |
| 11 | 2436218 |
| 12 | 24587064 |
| 13 | 272556602 |
| 14 | 3292267868 |
| 15 | 43042354506 |
| 16 | 605561401328 |
| 17 | 9122604404714 |
| 18 | 146517362114292 |
| 19 | 2499223145799098 |