Search: id:A128228
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%I A128228
%S A128228 1,2,2,3,6,3,4,8,12,4,5,10,15,20,5,6,12,18,24,30,6,7,14,21,28,35,42,7,
               8,
%T A128228 16,24,32,40,48,56,8,9,18,27,36,45,54,63,72,9,10,20,30,40,50,60,70,80,
%U A128228 90,10
%N A128228 A128229 * A002260.
%C A128228 Row sums = A006000: (1, 4, 12, 28, 55, 96, 154,...).
%F A128228 A128229 * A002260 as infinite lower triangular matrices. Triangle, n 
               * (each term of A128227).
%e A128228 First few rows of the triangle are:
%e A128228 1;
%e A128228 2, 2;
%e A128228 3, 6, 3;
%e A128228 4, 8, 12, 4;
%e A128228 5, 10, 15, 20, 5;
%e A128228 6, 12, 18, 24, 30, 6;
%e A128228 7, 14, 21, 28, 35, 42, 7;
%e A128228 ...
%Y A128228 Cf. A128229, A002260, A006000, A128227.
%Y A128228 Sequence in context: A015051 A064426 A051173 this_sequence A125102 A003506 
               A047662
%Y A128228 Adjacent sequences: A128225 A128226 A128227 this_sequence A128229 A128230 
               A128231
%K A128228 nonn,tabl
%O A128228 1,2
%A A128228 Gary W. Adamson (qntmpkt(AT)yahoo.com), Feb 19 2007

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