Sequence

Write the first 6 members of these sequence:

a1 = 5
a2 = 7
an+2 = an+1 +2 an

Correct result:

a1 =  5
a2 =  7
a3 =  17
a4 =  31
a5 =  65
a6 =  127

Solution:

a1=5
a2=7
a3=7+25=17
a4=17+27=31
a5=31+217=65
a6=65+231=127



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