Search: id:A144328
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%I A144328
%S A144328 1,1,1,1,1,2,1,1,2,3,1,1,2,3,4,1,1,2,3,4,5,1,1,2,3,4,5,6,1,1,2,3,4,5,6,
%T A144328 7,1,1,2,3,4,5,6,7,8,1,1,2,3,4,5,6,7,8,9,1,1,2,3,4,5,6,7,8,9,10,1,1,2,
               3,
%U A144328 4,5,6,7,8,9,10,11
%N A144328 A002260 preceded by a column of 1's: a (1, 1, 2, 3, 4, 5,...) crescendo 
               triangle by rows.
%C A144328 Row sums = A000124: (1, 2, 4, 7, 11, 16, 22, 19,...).
%C A144328 Eigensequence of the triangle = A000142, the factorials.
%C A144328 The triangle as an infinite lower triangular matrix * [1,2,3,...] = A064999: 
               (1, 3, 9, 21, 41, 113,...).
%C A144328 Generated from A128227 by rotating each row by one position to the right. 
               [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 25 2008]
%F A144328 Triangle A002260 (natural numbers crescendo triangle) preceded by a column 
               of 1's, = a (1, 1, 2, 3, 4, 5,...) crescendo triangle by rows.
%e A144328 First few rows of the triangle =
%e A144328 1;
%e A144328 1, 1;
%e A144328 1, 1, 2;
%e A144328 1, 1, 2, 3;
%e A144328 1, 1, 2, 3, 4;
%e A144328 1, 1, 2, 3, 4, 5;
%e A144328 ...
%Y A144328 A002260, Cf. A000124, A000142, A064999
%Y A144328 Sequence in context: A088426 A124769 A128227 this_sequence A140207 A104763 
               A027751
%Y A144328 Adjacent sequences: A144325 A144326 A144327 this_sequence A144329 A144330 
               A144331
%K A144328 nonn,tabl
%O A144328 1,6
%A A144328 Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 18 2008

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