User blog comment:BlauesWasser/Pran - Powerful Repeating Array Notation/@comment-80.98.179.160-20180307125618/@comment-30754445-20180309140737

@Planetrobloon

"I don't have time to use MathJax right now, but I think that makes it an f[w+1](f[w](n)) level function."

Yup.