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 A371301 #9 Apr 18 2025 12:39:12 %S A371301 1,3,10,35,124,441,1570,5591,19912,70917,252574,899555,3203812, %T A371301 11410545,40639258,144738863,515495104,1835963037,6538879318, %U A371301 23288564027,82943450716,295407480201,1052109342034,3747142986503,13345647643576,47531228903733,169284981998350 %N A371301 Expansion of (x^2 + x - 1)/((1 - x)*(2*x^2 + 3*x - 1)). Row sums of A371300. %H A371301 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (4,-1,-2). %p A371301 gf := (x^2 + x - 1)/((1 - x)*(2*x^2 + 3*x - 1)): %p A371301 ser := series(gf, x, 32): seq(coeff(ser, x, n), n = 0..26); %Y A371301 Cf. A371300. %K A371301 nonn,easy %O A371301 0,2 %A A371301 _Peter Luschny_, Mar 18 2024