Sum of all even numbers in Collatz (3x+1) trajectory of n.

Terms

a(0) =0a(1) =2a(2) =40a(3) =6a(4) =30a(5) =46a(6) =234a(7) =14a(8) =276a(9) =40a(10) =212a(11) =58a(12) =100a(13) =248a(14) =562a(15) =30a(16) =178a(17) =294a(18) =424a(19) =60a(20) =126a(21) =234a(22) =516a(23) =82a(24) =538a(25) =126a(26) =81178a(27) =276a(28) =366a(29) =592