#Pascal's Triangle

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thick vector
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why not just use ncr?

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anyway 4th row is 14641

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so 81x^8+4*27x^5+6*9x^2+4*3x^-1+x^-4
81x^8+108x^5+54x^2+12x^-1+x^-4

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(3x^2)^4=3^4*(x^2)^4=81*x^8

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and for the 108 its because
(3x^2)^3=27x^6 and you multiply it by 4 as its the second term so you use the second number in that row of pascals triangle which is 4