%I A131818
%S A131818 1,2,2,3,2,3,4,2,3,4,5,2,3,4,5,6,2,3,4,5,6,7,2,3,4,5,6,7,8,2,3,4,5,6,7,
%T A131818 8,9,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10
%N A131818 A130296 + A002260 - A000012. Triangle read by rows: row n consists of 
               n, 2, 3, 4,...n.
%C A131818 Row sums = A034856; (1, 4, 8, 13, 19, 26, 34,...).
%F A131818 A130296 + A002260 - A000012 as infinite lower triangular matrices.
%e A131818 First few rows of the triangle are:
%e A131818 1;
%e A131818 2, 2;
%e A131818 3, 2, 3;
%e A131818 4, 2, 3, 4;
%e A131818 5, 2, 3, 4, 5;
%e A131818 6, 2, 3, 4, 5, 6;
%e A131818 7, 2, 3, 4, 5, 6, 7;
%e A131818 ...
%Y A131818 Cf. A130296, A002260, A034856.
%Y A131818 Sequence in context: A101037 A002199 A104324 this_sequence A070081 A034883 
               A071647
%Y A131818 Adjacent sequences: A131815 A131816 A131817 this_sequence A131819 A131820 
               A131821
%K A131818 nonn,tabl,more
%O A131818 1,2
%A A131818 Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 18 2007