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J, 28 bytes [:}.@{.m&(+/ .*)&m=.2 1,:1 0 Try it online! Tacit matmul solve. x&u&y applies x to y n times.
Answer
#1: Initial revision
by
south
·
2022-04-26T21:37:09Z (over 2 years ago)
# [J](https://www.jsoftware.com), 28 bytes
```
[:}.@{.m&(+/ .*)&m=.2 1,:1 0
```
[Try it online!](https://tio.run/##y/r/P03B1koh2qpWz6FaL1dNQ1tfQU9LUy3XVs9IwVDHylDBgCs1OSNfIU0hNTE5QyFTT8HQ9P9/AA)
Tacit matmul solve. `x&u&y` applies `x` to `y` `n` times.