| 数学
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萨恩_,_,k_]:=sa[n,,k=a[n+1-k,,1]+如果[n<2k,,0, -, -sa[n-k,,【k】】;a[1号机组,,1 ] := 1;
a【n】_,_,1]:=a[n,,1]=总和[a[i,,1]sa[n-1,,i]我, {, {我,,1,,n-1}]/(n-1);
a【n】_,_,k_]:=a[n,,k]=总和[a[i,,1]a[n-i,,k-1号机组], {], {我,,1,,n-1}];
表[a[i,,4]/8+总和[a[i,,j个], {], {j个,,5,,i} ]/2-If[OddQ[i],],0,,a[i/2,,2 ]/8
-如果[OddQ[i/2],],0,,a[i/4,,1]/4]+总和[a[i/2,,j个], {], {j个,,三,,i/2}]/2]
-总和[a[j,,1]a[i-2j,,2]/4+总和[If[OddQ[k],],a[j,
(k-1)/2]a[i-2j,,1],],0], {], {k个,,5,,i} ]/2, {{j个,,1, (, (i-1)/2} ], {} ], {我,,4,,30} ]
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