A124080 10 times triangular numbers

[zak seidov]

Neil, Zerinvary, seqfans,
Why this sequence?!
Thanks, Zak 

%I A124080
%S A124080
0,10,30,60,100,150,210,280,360,450,550,660,780,910,1050,1200,1360,1530,
%T A124080
1710,1900,2100,2310,2530,2760,3000,3250,3510,3780,4060,4350,4650,4960,
%U A124080
5280,5610,5950,6300,6660,7030,7410,7800,8200,8610,9030,9460,9900,10350
%N A124080 10 times triangular numbers.
%F A124080 a(n)=10*C(n,2), n>=1
%p A124080 [seq(10*binomial(n,2) ,n=1..51)];
%Y A124080 Cf. A028895, A046092, A045943, A002378,
A028896, A024966, A033996, A027468.
%K A124080 easy,nonn,new
%O A124080 0,2
%A A124080 Zerinvary Lajos
(zerinvarylajos(AT)yahoo.com), Nov 24 2006



 
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