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{x/⍨⍵≥x←⌽{1∧+∘÷/0,⍵/1}¨⍳2+⍵¨⍳2×⍵}
Requires ⎕IO←0.
⎕IO←0
Try it online!Try it online!
How?
{1∧+∘÷/0,⍵/1} - apply fibonacci
{1∧+∘÷/0,⍵/1}
¨⍳2+⍵¨⍳2×⍵ - to the range 00 ..n+1 2n
¨⍳2+⍵¨⍳2×⍵
0
2n
x←⌽ - reverse and assign to x
x←⌽
x
x/⍨ - filter x with
x/⍨
⍵≥x - the function x <= n
⍵≥x
x <= n
{x/⍨⍵≥x←⌽{1∧+∘÷/0,⍵/1}¨⍳2+⍵}
Try it online!
¨⍳2+⍵ - to the range 0..n+1
¨⍳2+⍵
{x/⍨⍵≥x←⌽{1∧+∘÷/0,⍵/1}¨⍳2×⍵}
¨⍳2×⍵ - to the range 0 .. 2n
¨⍳2×⍵
