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 A156934 #4 Jul 22 2025 06:22:19 %S A156934 1,8,38,144,487,1552,4796,14592,44061,132568,398210,1195280,3586659, %T A156934 10760992,32284216,96854144,290564217,871694760,2615086750,7845263120, %U A156934 23535792671,70607381808 %N A156934 G.f. of the z^1 coefficients of the FP2 in the second column of the A156925 matrix. %F A156934 a(n)=6*a(n-1)-12*a(n-2)+10*a(n-3)-3*a(n-4)+2 %F A156934 a(n)=7*a(n-1)-18*a(n-2)+22*a(n-3)-13*a(n-4)+3*a(n-5) %F A156934 a(n):= -1/6*n^3-n^2-7/3*n-9/4+9/4*3^n %F A156934 G.f.: GF4(z;m=1) = z*(1+z)/((1-3*z)*(1-z)^4) %Y A156934 Cf. A156933 %Y A156934 Equals second column of A156925 %Y A156934 Other columns A156935, A156936, A156937 %K A156934 easy,nonn %O A156934 1,2 %A A156934 _Johannes W. Meijer_, Feb 20 2009