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%I #7 Feb 15 2022 07:34:14
%S 1,5,2,12,7,3,22,15,9,4,35,26,18,11,5,51,40,30,21,13,6,70,57,45,34,24,
%T 15,7,92,77,63,50,38,27,17,8,117,100,84,69,55,42,30,19,9,145,126,108,
%U 91,75,60,46,33,21,10
%N A128064 * A122432 (unsigned).
%C Left border of the triangle = A000326, the pentagonal numbers: (1, 5, 12, 22, 35, ...).
%C Row sums = A002412: (1, 7, 22, 50, 95, ...).
%F A128064 * A122432 (unsigned), where the unsigned version of A122432 = (1; 3, 1; 6, 3, 1; 10, 6, 3, 1; ...).
%e First few rows of the triangle:
%e 1;
%e 5, 2;
%e 12, 7, 3;
%e 22, 15, 9, 4;
%e 35, 26, 18, 11, 5;
%e 51, 40, 30, 21, 13, 6;
%e 70, 57, 45, 34, 24, 15, 7;
%e ...
%Y Cf. A128064, A122432, A000326, A002412.
%K nonn,tabl
%O 1,2
%A _Gary W. Adamson_, Feb 14 2007
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