%I A005476
%S A005476 0,2,9,21,38,60,87,119,156,198,245,297,354,416,483,555,
%T A005476 632,714,801,893,990,1092,1199,1311,1428,1550,1677,1809,
%U A005476 1946,2088,2235,2387,2544,2706,2873,3045,3222,3404,3591
%N A005476 n*(5n-1)/2.
%F A005476 a(n)=C(5*n,2)/5,n>=0 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), 
               Jan 02 2007
%F A005476 a(n)=A033991(n)-A000326(n). - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), 
               Jun 11 2007
%F A005476 a(n)=5*n+a(n-1)-8 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Nov 12 2009]
%e A005476 For n=2, a(2)=5*2+0-8=2; n=3, a(3)=5*3+2-8=9; n=4, a(4)=5*4+9-8=21 [From 
               Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 12 2009]
%p A005476 [seq(binomial(5*n,2)/5,n=0..38)]; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), 
               Jan 02 2007
%t A005476 lst={};Do[AppendTo[lst, n*(5*n-1)/2], {n, 0, 5!}];lst ...and/or... s=0;
               lst={s};Do[s+=n+1;AppendTo[lst, s], {n, 1, 6!, 5}];lst [From Vladimir 
               Orlovsky (4vladimir(AT)gmail.com), Oct 25 2008]
%t A005476 Table[Sum[i + 2*n - 1, {i, 1, n}], {n, 0, 42}] [From Zerinvary Lajos 
               (zerinvarylajos(AT)yahoo.com), Jul 11 2009]
%Y A005476 Sequence in context: A041285 A002888 A041963 this_sequence A131476 A023549 
               A024850
%Y A005476 Adjacent sequences: A005473 A005474 A005475 this_sequence A005477 A005478 
               A005479
%K A005476 nonn,new
%O A005476 0,2
%A A005476 N. J. A. Sloane (njas(AT)research.att.com).