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 A162009 #4 Jun 02 2025 01:45:21 %S A162009 272,52736,4766048,319830400,18598875760,1002968825344,51882638754240, %T A162009 2621627565515520,130715075544000720,6468157990602644480, %U A162009 318685706549526508832,15663443488266952501376,768809642314801857986608 %N A162009 Fourth right hand column of the EG1 triangle A162005. %F A162009 a(n) = (252105*49^n-525+76545*9^n-328125*25^n-225000*25^n*n-2320*n+134136*9^n*n-2112*n^2+46656*9^n*n^2-512*n^3)/3072 %F A162009 a(n) = 130*a(n-1)-6501*a(n-2)+163160*a(n-3)-2236466*a(n-4)+17123340*a(n-5)-71497186*a(n-6)+154127320*a(n-7)-174334221*a(n-8)+98986050*a(n-9)-22325625*a(n-10) %F A162009 GF(z) = (272+17376*z-321360*z^2-1298624*z^3+8914800*z^4-11262240*z^5-10206000*z^6)/((1-z)^4*(1-9*z)^3*(1-25*z)^2*(1-49*z)) %Y A162009 Fourth right hand column of the EG1 triangle A162005. %Y A162009 Other right hand columns are A004004 (2x), A162008 and A162010. %Y A162009 Cf. A162011 and A162014. %K A162009 easy,nonn %O A162009 1,1 %A A162009 _Johannes W. Meijer_, Jun 27 2009