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  • $\begingroup$ @Markhain You don’t have to read my formula. You can read the articles I posted. Y[4,1,2] shouldn’t be one, it counts the elements in Ff[n] and should be 13. As with X[4,1,2], It should be greater than zero. Do you know how to correct this? $\endgroup$ Commented Sep 30, 2019 at 14:09
  • $\begingroup$ @Arbuja I edited it in. $\endgroup$ Commented Oct 1, 2019 at 4:43
  • $\begingroup$ I still get X[4,1,2] equals zero. I don't know why? I doubt we can calculate Limit[d[n,1,2],n->Infinity]. How would we do that? I made (mathematica.stackexchange.com/questions/207177/… question] just in case. $\endgroup$ Commented Oct 1, 2019 at 16:37
  • $\begingroup$ @Arbuja Sorry there was a typo ({j, k} a ∈ Integers in stead of {j, k} ∈ Integers) in the code. Fixed it and double checked that the code in the answer is working. $\endgroup$ Commented Oct 2, 2019 at 4:18
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    $\begingroup$ @Arbuja have you tried consequently calculating d[n,1,2] while manually increasing n, and investigate resulting sequence by hand? $\endgroup$ Commented Oct 2, 2019 at 13:33