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 | 15 |
| 2 | 155 |
| 3 | 1144 |
| 4 | 7927 |
| 5 | 55333 |
| 6 | 388598 |
| 7 | 2743444 |
| 8 | 19437479 |
| 9 | 138010718 |
| 10 | 981047716 |
| 11 | 6977843175 |
| 12 | 49645292212 |
| 13 | 353262192994 |
| 14 | 2513898151334 |
| 15 | 17890175634324 |
| 16 | 127318180862693 |
| 17 | 906089796193803 |
| 18 | 6448444001034017 |
| 19 | 45892351529878911 |