El Gradechi's hybrid coefficients alpha^{6,6}_{2n}, negated.

Terms

a(0) =1008a(1) =21168a(2) =127008a(3) =465696a(4) =1297296a(5) =3027024a(6) =6237504a(7) =11721024a(8) =20511792a(9) =33918192a(10) =53555040a(11) =81375840a(12) =119705040a(13) =171270288a(14) =239234688a(15) =327229056a(16) =439384176a(17) =580363056a(18) =755393184a(19) =970298784a(20) =1231533072a(21) =1546210512a(22) =1922139072a(23) =2367852480a(24) =2892642480a(25) =3506591088a(26) =4220602848