1-x-2*x^2-10*x^3-74*x^4-706*x^5-8162*x^6-110410*x^7-。。。
A(x)^n中的系数开始于:
n=1:[1,-1,-2,-10,-74,-706,-8162,-110410,…];
n=2:[1,-2,(-3),-16,-124,-1224,-14516,-200192,…];
n=3:[1,-3,(-3),-19,-156,-1596,-19412,-272772,…];
n=4:[1,-4,-2,(-20),-175,-1856,-23136,-33108,…];
n=5:[1,-5,0,(-20),-185,-2031,-25920,-377280,…];
n=6:[1,-6,3,-20,(-189),-2142,-27951,-413568,…];
n=7:[1,-7,7,-21,(-189),-2205,-29379,-441519,…];
n=8:[1,-8,12,-24,-186,(-2232),-30324,-462504,…];
n=9:[1,-9,18,-30,-180,(-2232),-30882,-477666,…];
n=10:[1,-10,25,-40,-170,-2212,(-31130),-487960,…];
n=11:[1,-11,33,-55,-154,-2178,(-31130),-494186,…]。。。
其中括号中的系数显示了以下特性:
(2) 当n>=2时,[x^n]A(x)^(2*n-2)=[x^n],
(3) [x^n]A(x)^(2*n-1)=-(2*n-1)*A000699号(n) 对于n>=1:
A000699号= [1/1, 3/3, 20/5, 189/7, 2232/9, 31130/11, ...].
(结束)