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 A109467 #6 Jul 10 2015 19:54:34 %S A109467 1,26,256,2472,25056,250016,2499456,25002112,249995776,2500000256, %T A109467 25000032256,249999869952,2500000260096,25000000004096, %U A109467 249999997894656,2500000008404992,24999999983190016,250000000000065536,2500000000134086656,24999999999463391232 %N A109467 4 X 4 analog of A094943. %F A109467 a(n+4)=4*a(n+3)+44*a(n+2)+144*a(n+1)+160*a(n), a(0) = 1, a(1) = 26, a(2) = 256, a(3) = 2472. %F A109467 G.f.: (1+22*x+108*x^2+160*x^3)/(1-4*x-44*x^2-144*x^3-160*x^4). %K A109467 nonn %O A109467 0,2 %A A109467 _N. J. A. Sloane_, based on email from Alec Mihailovs, Aug 28 2005