# [Jelly], 21 bytes, [A000042](https://oeis.org/A000042)

(uses Jelly codepage)

    %%1@JJOOiv¤ØØȷȷḌṁị“”€

(The two quotes are different: one is opening and the other is closing).

This yields the unary representation of the input.

Difficulty: Only 1.6 quadrillion possibilities!

[Jelly]: https://github.com/DennisMitchell/jelly
[TIO-j5msy2ck]: https://tio.run/##AS8A0P9qZWxsef//JSUxQEpKT09pdsKkw5jDmMi3yLfhuIzhuYHhu4vigJzigJ3igqz//w "Jelly – Try It Online"