%I A084899
%S A084899 0,1,9,42,152,480,1392,3808,9984,25344,62720,152064,362496,851968,
%T A084899 1978368,4546560,10354688,23396352,52494336,117047296,259522560,
%U A084899 572522496,1257242624,2749366272,5989466112,13002342400,28135391232
%N A084899 Binomial transform of heptagonal numbers A000566.
%C A084899 Binomial transform is A084900. 2nd binomial transform of (0,1,5,0,0,0,
               ....).
%F A084899 G.f.: x(1 + 3x)/(1 - 2x)^3; a(n)=2^(n - 2)*n(5n - 1)/2.
%Y A084899 Sequence in context: A000971 A061927 A051923 this_sequence A074443 A007227 
               A116015
%Y A084899 Adjacent sequences: A084896 A084897 A084898 this_sequence A084900 A084901 
               A084902
%K A084899 easy,nonn
%O A084899 0,3
%A A084899 Paul Barry (pbarry(AT)wit.ie), Jun 10 2003