Search: id:A131914
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%I A131914
%S A131914 1,4,2,7,5,3,10,8,6,4,13,11,9,7,5,16,14,12,10,8,6,19,17,15,13,11,9,7,22,
%T A131914 20,18,16,14,12,10,8,25,23,21,19,17,15,13,11,9,28,26,24,22,20,18,16,14,
%U A131914 12,10
%N A131914 3*A002024 - 2*A051340.
%C A131914 Row sums = the hexagonal numbers, A000384: (1, 6, 15, 28, 45,...).
%F A131914 3*A002024 - 2*A051340 as infinite lower triangular matrices.
%e A131914 First few rows of the triangle are:
%e A131914 1;
%e A131914 4, 2;
%e A131914 7, 5, 3;
%e A131914 10, 8, 6, 4;
%e A131914 13, 11, 9, 7, 5;
%e A131914 16, 14, 12, 10, 8, 6;
%e A131914 19, 17, 15, 13, 11, 9, 7;
%e A131914 ...
%Y A131914 Cf. A002024, A051340, A000384.
%Y A131914 Sequence in context: A130849 A138754 A021963 this_sequence A115302 A109857 
               A002560
%Y A131914 Adjacent sequences: A131911 A131912 A131913 this_sequence A131915 A131916 
               A131917
%K A131914 nonn,tabl
%O A131914 1,2
%A A131914 Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 27 2007

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