Search: id:A014642
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%I A014642
%S A014642 0,8,40,96,176,280,408,560,736,936,1160,1408,1680,1976,2296,2640,3008,
               3400,
%T A014642 3816,4256,4720,5208,5720,6256,6816,7400,8008,8640,9296,9976,10680,11408,
%U A014642 12160,12936,13736,14560,15408,16280,17176,18096,19040,20008,21000,22016
%N A014642 Even octagonal numbers: 4*n*(3*n-1).
%C A014642 8 times pentagonal numbers. [From Omar E. Pol (info(AT)polprimos.com), 
               Dec 11 2008]
%F A014642 a(n) = A000326(n)*8. [From Omar E. Pol (info(AT)polprimos.com), Dec 11 
               2008]
%F A014642 a(n) = A049450(n)*4 = A033579(n)*2. [From Omar E. Pol (info(AT)polprimos.com), 
               Dec 13 2008]
%F A014642 a(n)=24*n+a(n-1)-40 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Nov 14 2009]
%e A014642 For n=2, a(2)=24*2+0-40=8; n=3, a(3)=24*3+8-40=40; n=4, a(4)=24*4+40-40=96 
               [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 14 2009]
%t A014642 s=0;lst={s};Do[s+=n++ +8;AppendTo[lst, s], {n, 0, 8!, 24}];lst [From 
               Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 16 2008]
%Y A014642 Cf. A000567, A014641, A014793, A014794, A033579.
%Y A014642 Cf. A000326. [From Omar E. Pol (info(AT)polprimos.com), Dec 11 2008]
%Y A014642 Cf. A049450. [From Omar E. Pol (info(AT)polprimos.com), Dec 13 2008]
%Y A014642 Sequence in context: A154425 A120931 A069083 this_sequence A143943 A135796 
               A105374
%Y A014642 Adjacent sequences: A014639 A014640 A014641 this_sequence A014643 A014644 
               A014645
%K A014642 nonn,new
%O A014642 0,2
%A A014642 Mohammad K. Azarian (ma3(AT)evansville.edu)
%E A014642 More terms from Patrick De Geest (pdg(AT)worldofnumbers.com)

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