表[级数系数[积[(1+n^(k-1)x^k),{k,1,n}],{x,0,n}],{n,0,20}]
取消保护[电源];0^0 = 1; 表[Sum[Length[Select[IntegerPartitions[n,{k}],UnsameQ@#&]]n ^(n-k),{k,0,Floor[(Sqrt[8 n+1]-1)/2]}],{n,0,20}]
连接[{1},表[SeriesCoefficient[n*QPochhammer[-1/n,n*x]/(n+1),{x,0,n}],{n,1,20}]](*瓦茨拉夫·科特索维奇2021年5月9日*)