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 A110212 #9 Sep 04 2024 08:47:10 %S A110212 -1,5,-25,119,-565,2675,-12661,59915,-283525,1341659,-6348805, %T A110212 30042875,-142164421,672729275,-3183389125,15063959099,-71283419845, %U A110212 337316764475,-1596200067781,7553299819835,-35742598512325,169135792154939,-800359161855685,3787340218204475 %N A110212 a(n+3) = 6*a(n) - 5*a(n+2), a(0) = -1, a(1) = 5, a(2) = -25. %C A110212 Superseeker finds: a(n+1) - a(n) = ((-1)^n)*A030192(n+1) (Scaled Chebyshev U-polynomial evaluated at sqrt(6)/2) %F A110212 G.f.: 1/((x-1)*(6*x^2+6*x+1)). %p A110212 eriestolist(series(1/((x-1)*(6*x^2+6*x+1)), x=0,25)); -or- Floretion Algebra Multiplication Program, FAMP Code: 2basejsumseq[A*B] with A = + 'i + 'ii' + 'ij' + 'ik' and B = + .5'i - .5'j + .5'k + .5i' + .5j' - .5k' - .5'ij' - .5'ik' + .5'ji' + .5'ki' Sumtype is set to: sum[(Y[0], Y[1], Y[2]),mod(3) %Y A110212 Cf. A030192, A110210, A110211, A110213. %K A110212 easy,sign %O A110212 0,2 %A A110212 _Creighton Dement_, Jul 16 2005