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 A156923 #4 Jul 22 2025 06:21:52 %S A156923 1,37,646,8030,82610,756218,6411720,51586344,400011435,3020658295, %T A156923 22373863774,163379472214,1180488191108,8462445970580,60305767988960, %U A156923 427848087263712,3025286818472661 %N A156923 Fourth right hand column (n-m=3) of the A156920 triangle. %F A156923 a(n) = 30*a(n-1)-385*a(n-2)+2776*a(n-3)-12418*a(n-4)+35908*a(n-5)-67818*a(n-6)+82552*a(n-7)-62109*a(n-8)+26190*a(n-9)-4725*a(n-10) %F A156923 a(n) = (-8*n^3+972*n^2*3^n-84*n^2+7776*n*3^n-11250*n*5^n-286*n+15309*3^n-50625*5^n+36015*7^n-315)/384 %F A156923 G.f.: GF1(z;RHCnr=4) = (1+7*z-79*z^2+119*z^3+126*z^4-270*z^5)/((1-7*z)*(1-5*z)^2*(1-3*z)^3*(1-z)^4) %Y A156923 Other columns A000340, A156922, A156924. %Y A156923 Equals A156920 fourth right hand column. %Y A156923 Equals A156919 fourth right hand column divided by 8. %Y A156923 Equals A142963 fourth right hand column divided by 2^n %K A156923 easy,nonn %O A156923 0,2 %A A156923 _Johannes W. Meijer_, Feb 20 2009