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 A067404 #14 Sep 30 2022 14:37:22
%S A067404 1,7,112,1792,28672,458752,7340032,117440512,1879048192,30064771072,
%T A067404 481036337152,7696581394432,123145302310912,1970324836974592,
%U A067404 31525197391593472,504403158265495552,8070450532247928832,129127208515966861312,2066035336255469780992,33056565380087516495872
%N A067404 Fourth column of triangle A067402.
%H A067404 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (16).
%F A067404 a(n) = A067402(n+3, 3).
%F A067404 a(n) = 7*16^(n-1), n>=1, a(0) = 1.
%F A067404 G.f.: (1-9*x)/(1-16*x).
%F A067404 E.g.f.: (9 + 7*exp(16*x))/16. - _Stefano Spezia_, Sep 30 2022
%t A067404 CoefficientList[Series[(1-9x)/(1-16x),{x,0,20}],x] (* _Harvey P. Dale_, Jun 02 2017 *)
%Y A067404 Cf. A067403 (third column), A067405 (fifth column), A001025 (powers of 16).
%Y A067404 Cf. A067402.
%K A067404 nonn,easy
%O A067404 0,2
%A A067404 _Wolfdieter Lang_, Jan 25 2002
%E A067404 More terms from _Harvey P. Dale_, Jun 02 2017