I will approach it using brute force, but with the aid of my own program that I have already developed. Let me offer a slight hint regarding my counting formula, which involves (LFSR counting), but definitely without counting power; I am still incomplete and I am specifically discussing pure counting, so obvious it's puzzle 66 first.
That's awesome zahid!
according to my math and calculations, puzzle 130 is still more solvable than puzzle 66. I even assume, that #130 will get solved waay before 66 does.
That's just according to my math and calculations.
I don't know what kind of method LFSR is, but sounds interesting zahid! Goodluck to to you mate!