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 A283827 Irregular triangle read by rows: T(n,k) = number of trees on n nodes with load k, n>=1, 1 <= k <= floor(n/2). 1
 0, 1, 1, 1, 1, 1, 2, 1, 2, 3, 1, 3, 7, 1, 3, 9, 10, 1, 4, 12, 30, 1, 4, 18, 38, 45, 1, 5, 21, 64, 144, 1, 5, 27, 91, 217, 210 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,7 COMMENTS The load of a tree is the maximal branch weight from the centroid. LINKS Peter Steinbach, Field Guide to Simple Graphs, Volume 3, Part 8 (For Volumes 1, 2, 3, 4 of this book see A000088, A008406, A000055, A000664, respectively.) EXAMPLE Triangle begins:   0,   1,   1,   1, 1,   1, 2,   1, 2,  3,   1, 3,  7,   1, 3,  9, 10,   1, 4, 12, 30,   1, 4, 18, 38,  45,   1, 5, 21, 64, 144,   1, 5, 27, 91, 217, 210,   ... CROSSREFS Cf. A283826. See also A000676, A000677, A027416, A102911. Sequence in context: A110062 A144215 A254539 * A122087 A139642 A264744 Adjacent sequences:  A283824 A283825 A283826 * A283828 A283829 A283830 KEYWORD nonn,tabf,more AUTHOR N. J. A. Sloane, Mar 19 2017 STATUS approved

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Last modified May 10 03:11 EDT 2021. Contains 343747 sequences. (Running on oeis4.)