Something like this should do the trick, good old coffee. pascal_r = (n) -> lines = [[1]] for i in [1...n] last = lines[i-1] lines[i] =

Something like this should do the trick, good old coffee. pascal_r = (n) -> lines = [[1]] for i in [1...n] last = lines[i-1] lines[i] = [] for j in [0..i] lines[i][j] = (last[j-1] or 0) + (last[j] or 0) lines[n-1] console.log pascal_r(1) console.log pascal_r(4) Edit: Bloody HN formatting got the better of me again.