#来自在线整数序列百科全书的问候!http://oeis.org/ 搜索:id:a130928 显示1-1的1个1 ;%I a130928;%S a130928 0,1,1,3,2,2,2,7,8,8,5,6,4,20,17,22,22,18,18,21,13,12,15,19,16,11,14,9,9,10,54,61,46,18,18,18,21,13,12,15,19,16,11,14,9,9,9,9,9,10,54,61,46,46,;%T%T a130928 57,45,45,45,63,59,49,49,48,55,54,64,50,62,58,58 52,56,60,43,47, %U a130928 53,44,33,30,39,51,42,28,37,23,24,29,38,25,26,27180158192157,187 %N A130928加泰罗尼亚自同构的签名排列:A130401的第20行。 %C A130928加泰罗尼亚自同构的签名置换,它是从第20个非递归的加泰罗尼亚自同构*A089862和递归模式REDRONI(定义见A130401);%H A130928 a.Karttunen,n=0..2055时的n,a(n)表%沪A130928Catalan自同构签名置换的索引项%Y A130928反向:A130927。 %K A130928 nonn %O A130928 0,3 %A A130928 Antti Karttunen,2007年6月11日 %K A130928 nonn %O A130928 nonn %O A130928 0,3