Search: id:A014640
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%I A014640
%S A014640 0,18,34,112,148,286,342,540,616,874,970,1288,1404,1782,1918,2356,2512,
               3010,
%T A014640 3186,3744,3940,4558,4774,5452,5688,6426,6682,7480,7756,8614,8910,9828,
               10144,
%U A014640 11122,11458,12496,12852,13950,14326,15484,15880,17098,17514,18792
%N A014640 Even heptagonal numbers (A000566).
%F A014640 G.f.:-2*x*(2*x^3+21*x^2+8*x+9)/((x+1)^2*(x-1)^3) [From Maksym Voznyy 
               (voznyy(AT)mail.ru), Aug 11 2009]
%Y A014640 Cf. A000566, A014637, A014773, A014792.
%Y A014640 Sequence in context: A093478 A044063 A044444 this_sequence A160844 A040306 
               A073332
%Y A014640 Adjacent sequences: A014637 A014638 A014639 this_sequence A014641 A014642 
               A014643
%K A014640 nonn
%O A014640 0,2
%A A014640 Mohammad K. Azarian (ma3(AT)evansville.edu)
%E A014640 Extended and description corrected by Patrick De Geest (pdg(AT)worldofnumbers.com)

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