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%I #5 Dec 29 2023 10:27:25
%S 1,1,2,3,4,5,2,5,6,7,5,7,10,11,12,3,8,10,13,14,15,7,10,15,17,20,21,22,
%T 4,11,19,21,24,25,26,9,13,20,23,28,30,33,34,35,5,14,18,25,28,33,35,38,
%U 39,40,11,16,25,29,36,39,44,49,50,51,6,17,22,31,35,42,45,50,52,55,56,57
%N A000012 * (A026741 * 0^(n-k)) * A000012, 1<=k<=n.
%C Left border = A026741: (1, 1, 3, 2, 5, 3, 7, 4, 9,...).
%C Right border = A001318 starting (1, 2, 5, 7, 12, 15,...).
%C Row sums = A122576, unsigned: (1, 3, 12, 20, 45, 63, 112,...).
%F A000012 * (A026741 * 0^(n-k)) * A000012, 1<=k<=n
%e First few rows of the triangle are:
%e 1;
%e 1, 2;
%e 3, 4, 5;
%e 2, 5, 6, 7;
%e 5, 7, 10, 11, 12;
%e 3, 8, 10, 13, 14, 15;
%e 7, 10, 15, 17, 20, 21, 22;
%e 4, 11, 14, 19, 21, 24, 25, 26;
%e ...
%Y Cf. A026741, A001318, A122576.
%K nonn,tabl
%O 1,3
%A _Gary W. Adamson_ & _Roger L. Bagula_, Jul 26 2008
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