%I A022264
%S A022264 0,3,13,30,54,85,123,168,220,279,345,418,498,585,679,780,
%T A022264 888,1003,1125,1254,1390,1533,1683,1840,2004,2175,2353,
%U A022264 2538,2730,2929,3135,3348,3568,3795,4029,4270,4518,4773
%N A022264 n*(7n-1)/2.
%F A022264 a(n)=C(7*n,2)/7,n>=0 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), 
               Jan 02 2007
%F A022264 a(n) = A049450(n) + A000217(n). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), 
               Oct 09 2008]
%F A022264 a(n)=3*a(n-1)-3*a(n-2)+a(n-3), with a(0)=0, a(1)=3 and a(2)=13 [From 
               Paolo P. Lava (ppl(AT)spl.at), Jul 29 2009]
%F A022264 a(n)=7*n+a(n-1)-11 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Nov 12 2009]
%e A022264 For n=2, a(2)=7*2+0-11=3; n=3, a(3)=7*3+3-11=13; n=4, a(4)=7*4+13-11=30 
               [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 12 2009]
%p A022264 [seq(binomial(7*n,2)/7,n=0..37)]; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), 
               Jan 02 2007
%t A022264 s=0;lst={s};Do[s+=n++ +3;AppendTo[lst, s], {n, 0, 6!, 7}];lst [From Vladimir 
               Orlovsky (4vladimir(AT)gmail.com), Nov 16 2008]
%t A022264 Array[ #*(7*# - 1)/2 &, 47, 0] # A022264 n*(7 n - 1)/2. [From Zerinvary 
               Lajos (zerinvarylajos(AT)yahoo.com), Jul 10 2009]
%Y A022264 Sequence in context: A023553 A154300 A051805 this_sequence A097955 A077717 
               A145907
%Y A022264 Adjacent sequences: A022261 A022262 A022263 this_sequence A022265 A022266 
               A022267
%K A022264 nonn
%O A022264 0,2
%A A022264 N. J. A. Sloane (njas(AT)research.att.com).