%I A072258
%S A072258 0,9,69,405,2133,10581,50517,234837,1070421,4805973,21321045,93672789,
%T A072258 408245589,1767200085,7605671253,32570168661,138870609237,589842175317,
%U A072258 2496807654741,10536986432853
%N A072258 ((6n+1)*4^n-1)/3.
%C A072258 Related to Collatz function (for n>0). All divisible by 3.
%Y A072258 Cf. A072257, A072259, A072260.
%Y A072258 Sequence in context: A024119 A120306 A089379 this_sequence A125372 A165147 
               A075045
%Y A072258 Adjacent sequences: A072255 A072256 A072257 this_sequence A072259 A072260 
               A072261
%K A072258 nonn
%O A072258 0,2
%A A072258 rathankar (rathankar(AT)yahoo.com), Jul 08 2002
%E A072258 Edited and extended by Henry Bottomley (se16(AT)btinternet.com), Aug 
               06 2002