View Compilation Error

0_0_32320223_27049.cpp:1:1: error: expected unqualified-id before 'if'
 if(n<2)
 ^
0_0_32320223_27049.cpp:3:4: error: expected unqualified-id before 'if'
    if(n%2==0)
    ^
0_0_32320223_27049.cpp:5:4: error: expected unqualified-id before 'else'
    else return 4*a((n-1)/2)+6*((n-1)/2);
    ^