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 A253808 #4 Jan 22 2015 01:29:56 %S A253808 1,1,4,2,-4,4,4,-12,4,-12,2,-24,-28,4,-8,-24,-36,4,2,-12,-16,2,4,-24, %T A253808 -20,-84,4,-48,2,-24,2,-48,-40,-36,-16,-24,-76,2,-56,-12,4,-48,4,2, %U A253808 -24,4,4,-24,4,-60,-72,-84,-108,4,-20,-48,-72,2,2,-24,-60,2,-48,-96,-28,-120,4,-36 %N A253808 a(n) = A106291(n)/(modified A223486(n)), n >= 1. %C A253808 This sequence uses A223486 with the first two entries 1, 3, as obtained when one considers the Lucas numbers A000204 for n >= 1 (not A000032 for n >= 0). %F A253808 a(n) = A106291(n)/(modified A223486(n)), n >= 1, where one uses A223486(1) = 1 and A223486(2) = 3. %Y A253808 Cf. A106291, A223486, A001176 (Fibonacci case). %K A253808 sign,easy %O A253808 1,3 %A A253808 _Wolfdieter Lang_, Jan 20 2015