Search: id:A131413
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%I A131413
%S A131413 1,4,3,7,6,3,10,9,8,7,13,12,11,10,9,16,15,14,13,12,11,19,18,17,16,15,14,
%T A131413 13,22,21,10,19,18,17,16,15,25,24,23,22,21,20,19,18,17,28,27,26,25,24,
%U A131413 23,22,21,20,19
%N A131413 A002024 + A128076 - A000012.
%C A131413 Row sums = A000566, the heptagonal numbers: (1, 7, 18, 34, 55,...).
%F A131413 A002024 + A128076 - A000012 as infinite lower triangular matrices. By 
               rows, (n+1) terms of 3n+1, 3n, 3n-1,...
%e A131413 First few rows of the triangle are:
%e A131413 1;
%e A131413 4, 3;
%e A131413 7, 6, 5;
%e A131413 10, 9, 8, 7;
%e A131413 13, 12, 11, 10, 9;
%e A131413 16, 15, 14, 13, 12, 11;
%e A131413 19, 18, 17, 16, 15, 14, 13;
%e A131413 ...
%Y A131413 Cf. A128076, A002024, A000566.
%Y A131413 Sequence in context: A093051 A089020 A046560 this_sequence A112887 A010654 
               A048227
%Y A131413 Adjacent sequences: A131410 A131411 A131412 this_sequence A131414 A131415 
               A131416
%K A131413 nonn,tabl
%O A131413 0,2
%A A131413 Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 08 2007

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