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 A077753 #24 May 20 2017 20:15:27 %S A077753 1,2,3,6,9,54,63,3402,3465,11787930,11791395,138996138862350, %T A077753 138996150653745,19319928257600060753067000750, %U A077753 19319928257600199749217654495,373259627878816004843210480238884928715510929499405871250 %N A077753 a(1) = 1, a(2) = 2, a(2n) = a(2n-1)*a(2n-2), a(2n+1)= a(2n-1) + a(2n). %Y A077753 Cf. A039941, A248479. %K A077753 nonn %O A077753 1,2 %A A077753 _Amarnath Murthy_, Nov 20 2002 %E A077753 More terms from _Sascha Kurz_, Jan 04 2003 %E A077753 Edited by _N. J. A. Sloane_, May 21 2008 at the suggestion of _R. J. Mathar_ %E A077753 Offset corrected from 0 to 1 by _Antti Karttunen_, Oct 26 2014