Search: id:A126890
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%I A126890
%S A126890 0,1,2,3,5,7,6,9,12,15,10,14,18,22,26,15,20,25,30,35,40,21,27,33,39,45,
%T A126890 51,57,28,35,42,49,56,63,70,77,36,44,52,60,68,76,84,92,100,45,54,63,72,
%U A126890 81,90,99,108,117,126,55,65,75,85,95,105,115,125,135,145,155,66,77,88
%N A126890 Triangle read by rows: T(n,k) = n*(n+2*k+1)/2, 0<=k<=n.
%C A126890 T(n,k) + T(n,n-k) = A014105(n);
%C A126890 row sums give A059270; Sum(T(n,k): 0<=k<n) = A000578(n);
%C A126890 central terms give A007742; T(2*n+1,n) = A016754(n);
%C A126890 T(n,0) = A000217(n);
%C A126890 T(n,1) = A000096(n) for n>0;
%C A126890 T(n,2) = A055998(n) for n>1;
%C A126890 T(n,3) = A055999(n) for n>2;
%C A126890 T(n,4) = A056000(n) for n>3;
%C A126890 T(n,5) = A056115(n) for n>4;
%C A126890 T(n,6) = A056119(n) for n>5;
%C A126890 T(n,7) = A056121(n) for n>6;
%C A126890 T(n,8) = A056126(n) for n>7;
%C A126890 T(n,10) = A101859(n-1) for n>9;
%C A126890 T(n,n-3) = A095794(n-1) for n>2;
%C A126890 T(n,n-2) = A045943(n-1) for n>1;
%C A126890 T(n,n-1) = A000326(n) for n>0;
%C A126890 T(n,n) = A005449(n).
%Y A126890 Cf. A110449.
%Y A126890 Sequence in context: A081622 A064143 A115274 this_sequence A122637 A076229 
               A160102
%Y A126890 Adjacent sequences: A126887 A126888 A126889 this_sequence A126891 A126892 
               A126893
%K A126890 nonn,tabl
%O A126890 0,3
%A A126890 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 30 2006

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