z 20 + 19 z 18 + 153 z 16 + 680 z 14 + 1820 z 12 + 3003 z 10 + 3003 z 8 + 1716 z 6 + 495 z 4 + 55 z 2 + 1 {\displaystyle z^{20}+19z^{18}+153z^{16}+680z^{14}+1820z^{12}+3003z^{10}+3003z^{8}+1716z^{6}+495z^{4}+55z^{2}+1}
