Search: id:A134249
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%I A134249
%S A134249 1,3,1,5,7,1,8,10,13,1,12,14,17,21,1,17,19,22,26,31,1,23,25,28,32,37,43,
%T A134249 1,30,32,35,39,44,50,57,1,38,40,43,47,52,58,65,73,1,47,49,52,56,61,67,
%U A134249 74,82,91,1
%N A134249 Triangle read by rows, taken from the lower triangular matrix (M * A000012 
               + A000012 * M) - A000012; where M = lower triangular matrix with 
               (1,1,1,...) in the main diagonal and the triangular numbers in the 
               subdiagonal and A000012 = (1; 1,1; 1,1,1;...).
%C A134249 Row sums = A037235: (1, 4, 13, 32, 65, 116,...). Left column = A134250: 
               (1, 3, 5, 8, 12, 17, 23,...).
%e A134249 First few rows of the triangle are:
%e A134249 1;
%e A134249 3, 1;
%e A134249 5, 7, 1;
%e A134249 8, 10, 13, 1;
%e A134249 12, 14, 17, 21, 1;
%e A134249 17, 19, 22, 26, 31, 1;
%e A134249 23, 25, 28, 32, 37, 43, 1;
%e A134249 ...
%Y A134249 Cf. A037235, A134250.
%Y A134249 Sequence in context: A130418 A038871 A143524 this_sequence A001607 A167433 
               A077020
%Y A134249 Adjacent sequences: A134246 A134247 A134248 this_sequence A134250 A134251 
               A134252
%K A134249 nonn,tabl,new
%O A134249 1,2
%A A134249 Gary W. Adamson (qntmpkt(AT)yahoo.com), Oct 15 2007
%E A134249 Edited by njas, Nov 01 2009

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