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 A289786 #19 May 06 2018 09:05:57 %S A289786 1,5,20,77,291,1098,4149,15689,59332,224369,848447,3208370,12132345, %T A289786 45878109,173486772,656035301,2480778763,9380993978,35473960589, %U A289786 134143768193,507260826084,1918192318185,7253589435975,27429241169378,103722891648049,392225150722037 %N A289786 p-INVERT of the odd positive integers (A005408), where p(S) = 1 - S - S^2. %C A289786 Suppose s = (c(0), c(1), c(2), ...) is a sequence and p(S) is a polynomial. Let S(x) = c(0)*x + c(1)*x^2 + c(2)*x^3 + ... and T(x) = (-p(0) + 1/p(S(x)))/x. The p-INVERT of s is the sequence t(s) of coefficients in the Maclaurin series for T(x). Taking p(S) = 1 - S gives the INVERT transform of s, so that p-INVERT is a generalization of the INVERT transform (e.g., A033453). %C A289786 See A289780 for a guide to related sequences. %H A289786 Clark Kimberling, <a href="/A289786/b289786.txt">Table of n, a(n) for n = 0..1000</a> %H A289786 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (5, -6, 5, 1) %F A289786 G.f.: (-1 - x^2 - 2 x^3)/(-1 + 5 x - 6 x^2 + 5 x^3 + x^4). %F A289786 a(n) = 5*a(n-1) - 6*a(n-2) + 5*a(n-3) + a(n-4). %t A289786 z = 60; s = x (1 + x)/(1 - x)^2; p = 1 - s - s^2; %t A289786 Drop[CoefficientList[Series[s, {x, 0, z}], x], 1] (* A005408 *) %t A289786 Drop[CoefficientList[Series[1/p, {x, 0, z}], x], 1] (* A289786 *) %t A289786 LinearRecurrence[{5,-6,5,1},{1,5,20,77},30] (* _Harvey P. Dale_, May 06 2018 *) %Y A289786 Cf. A005408, A289780. %K A289786 nonn,easy %O A289786 0,2 %A A289786 _Clark Kimberling_, Aug 10 2017