来自在线整数百科全书的问候语!http://oeis.org/ Search: id:a080981 Showing 1-1 of 1 %I A080981 %S A080981 0,2,10,12,44,50,52,178,180,204,210,216,228,716,722,728,740,818,820, %T A080981 844,866,868,872,914,920,932,2866,2868,2892,2914,2916,2920,2962,2968, %U A080981 2980,3276,3282,3288,3300,3378,3380,3468,3474,3480,3490,3492,3504,3528,3660 %N A080981 A014486-encodings of the trees whose interior zigzag-tree (Stanley's c) is branch-reduced (in the sense defined by Donaghey). %C A080981 Donaghey defines (on page 82 of his paper) the branch-reduced zigzag-trees as those zigzag-trees which do not contain longer than one-edge branches, where a branch is a maximal connected set of edges slanted to the same direction, with no perpendicular edges emanating from its middle. 这些形成自同构的原始元素A057 505/A057 506 .0%D A080981- R. Donaghey,Calalon树和包围J. Combin的自同构。理论,系列B,29(1980),75-90.0%H A080981- A. Karttunen,在0, 1, 2、3, 5, 6、7, 11, 12、15, 16, 18、20, 29, 30、32、…%Y A080981A(n)=A01448(A080980(n))。A080968,A08097 1。这些树是由A000 55 54 .0 %K A080981NAN80%9O A08098102%,A080981AANTI KARTUUNENEN MAR 02 2003μl内容在OEIS最终用户许可协议下可用:HTTP:/OEIS.Org/许可证