Search: id:A049777
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%I A049777
%S A049777 1,3,2,6,5,3,10,9,7,4,15,14,12,9,5,21,20,18,15,11,6,28,27,25,22,18,13,
               7,
%T A049777 36,35,33,30,26,21,15,8,45,44,42,39,35,30,24,17,9,55,54,52,49,45,40,34,
%U A049777 27,19,10,66,65,63,60,56,51,45,38,30,21,11,78,77,75,72,68,63,57,50
%N A049777 Triangular array read by rows: T(m,n) = n + n+1 + ... + m = (m+n)(m-n+1)/
               2.
%F A049777 Partial sums of A002260 row terms, starting from the right; e.g. row 
               3 of A002260 = (1, 2, 3), giving (6, 5, 3). - Gary W. Adamson (qntmpkt(AT)yahoo.com), 
               Oct 23 2007
%e A049777 Rows: {1}; {3,2}; {6,5,3}; ...
%o A049777 (PARI) {T(n,k) = if( k<1 | n<k, 0, (n + k) * (n - k + 1) / 2 )} /* Michael 
               Somos Oct 06 2007 */
%Y A049777 Row sums = A000330.
%Y A049777 Cf. A002260.
%Y A049777 Sequence in context: A164073 A090571 A088452 this_sequence A058401 A105027 
               A120913
%Y A049777 Adjacent sequences: A049774 A049775 A049776 this_sequence A049778 A049779 
               A049780
%K A049777 nonn,tabl
%O A049777 1,2
%A A049777 Clark Kimberling (ck6(AT)evansville.edu)

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