%I A072191
%S A072191 0,2,6,38,1446,2090918,4371938082726,19113842599189892819591078,
%T A072191 365338978906606237729724396156395693696687137202086,
%U A072191 133472569508521677503139972517335009022889462418844369330479463819154657319297609174034202576402751398
%N A072191 a(n)=a(n-1)^2+2.
%H A072191 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               WeaklyBinaryTree.html">Weakly Binary Tree</a>
%e A072191 0^2+2=2, 2^2+2=6, 6^2+2=38 ...
%t A072191 Table[ a[n], {n, 0, 10}]
%o A072191 (PARI) a(n)=if(n<1, 0, 2+a(n-1)^2) /* Michael Somos Mar 25 2006 */
%Y A072191 Cf. A003095.
%Y A072191 Sequence in context: A006536 A057297 A005530 this_sequence A118324 A060421 
               A054970
%Y A072191 Adjacent sequences: A072188 A072189 A072190 this_sequence A072192 A072193 
               A072194
%K A072191 easy,nonn
%O A072191 0,2
%A A072191 Miklos Kristof (kristmikl(AT)freemail.hu), Jul 02 2002
%E A072191 Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 03 2002