This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A061320 #10 Aug 17 2024 22:42:30 %S A061320 0,5,140,6080,186620,3504380,43599605,392515340,2738219580, %T A061320 15571795365,74962059260,314303754380,1173239918240,3966582090380, %U A061320 12313551210485,35488970536640,95826048090080,244240228906965,591327577603980,1367189227172480,3032433080571020 %N A061320 Column 4 of A061314. %F A061320 a(n) = A061318(n) + A061319(n)^2 = 5*A061321(n). %F A061320 G.f.: -5*x*(1 +11*x +876*x^2 +19780*x^3 +215084*x^4 +1114665*x^5 +2936419*x^6 +4038928*x^7 +2936419*x^8 +1114665*x^9 +215084*x^10 +19780*x^11 +876*x^12 +11*x^13+x^14) / (x-1)^17. - _R. J. Mathar_, Aug 11 2012 %F A061320 a(n) = n *(n+1) *(n^8+4*n^7+14*n^6+28*n^5+77*n^4+112*n^3+196*n^2+144*n+2304) *(n^2+n+4) * (n^4+2*n^3+5*n^2+4*n+36)/331776. - _R. J. Mathar_, Aug 11 2012 %Y A061320 Cf. A061314, A061318, A061319, A061321. %K A061320 nonn,easy %O A061320 0,2 %A A061320 _Henry Bottomley_, Apr 24 2001