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 A156924 #4 Jul 22 2025 06:21:59 %S A156924 1,83,2685,56285,919615,12813843,160206627,1854550395,20291056470, %T A156924 212826091180,2161547322134,21414479565774,208076662576370, %U A156924 1991164206775450,18825064380813450 %N A156924 Fifth right hand column (n-m=4) of the A156920 triangle. %F A156924 a(n)=55*a(n-1)-1365*a(n-2)+20251*a(n-3)-200557*a(n-4)+1402203*a(n-5)-7137473*a(n-6)+26886431*a(n-7)-75433971*a(n-8)+157376597*a(n-9)-241846607*a(n-10)+268663713*a(n-11)-208880991*a(n-12)+107416665*a(n-13)-32730075*a(n-14)+4465125*a(n-15) %F A156924 a(n)= (16*n^4-7776*n^3*3^n+256*n^3-104976*n^2*3^n+225000*n^2*5^n+ 1496*n^2- 464616*n*3^n+ 2250000*n*5^n-2016840*n*7^n+3776*n-673596*3^n+5568750*5^n-11092620*7^n+6200145*9^n+3465)/6144 %F A156924 G.f.: GF1(z;RHCnr=5) = (1+28*z-515*z^2+1654*z^3+8689*z^4-65864*z^5+142371*z^6-82242*z^7-99090*z^8+113400*z^9)/((1-9*z)*(1-7*z)^2*(1-5*z)^3*(1-3*z)^4*(1-z)^5) %Y A156924 Other columns A000340, A156922, A156923. %Y A156924 Equals A156920 fifth right hand column. %Y A156924 Equals A156919 fifth right hand column divided by 16. %Y A156924 Equals A142963 fifth right hand column divided by 2^n %K A156924 easy,nonn %O A156924 0,2 %A A156924 _Johannes W. Meijer_, Feb 20 2009