That is an interesting observation @matriks77. I did not include the full explanation of how the sequence was derived in the post. Let's take Series A for example, second number is 24 (4×4+4+4=24), the third number is 38 (4×4+4+4+2×4+2+4=38) or (24+2×4+2+4=38), the fourth number is 73 (4×4+4+4+2×4+2+4+3×8+3+8=73) or (38+3×8+3+8=73), etc... The numbers in the series are actually calculated using cumulative values. The second number in the series has no cumulative value.

I found providing the full description to be rather tedious so I substituted the previous number in the series to make the explanation easy. I thought repeating the same numbers again and again would make the logic harder to see. The substitution does not appear to work for the second numbers in the series. I hope my short cut explanation has not created any confusion.