Search: id:A073351
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%I A073351
%S A073351 0,4,125,1078,5220,18150,50869,122500,263568,519840,956725,1664234,
%T A073351 2762500,4407858,6799485,10186600,14876224,21241500,29730573,40876030,
%U A073351 55304900,73749214,97057125,126204588,162307600,206635000,260621829
%N A073351 n^2(n+1)(2n+1)^2(7n+1)/36.
%D A073351 Mentioned in a problem on p. 334 of Two-Year College Math. Jnl., Vol. 
               25, 1994.
%F A073351 a(n)=sum(i=1, n, i^2)*sum(i=n+1, 2*n, i^2).
%F A073351 G.f.: x(4+97x+287x^2+159x^3+13x^4)/(1-x)^7.
%Y A073351 Cf. A007750.
%Y A073351 Sequence in context: A005936 A090082 A068891 this_sequence A068894 A116944 
               A124260
%Y A073351 Adjacent sequences: A073348 A073349 A073350 this_sequence A073352 A073353 
               A073354
%K A073351 nonn
%O A073351 0,2
%A A073351 Michael Somos, Jul 27 2002

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