Can you find the last number in the below sequence puzzle? 16, 105, 636, 3175, 12704, 38109, ?

Answer 1

76220

Because 16*7-7=105
105*6+6=636
636*5-5=3175
3175*4+4=12704
12704*3-3=38109
38109*2+2=76220
odd is subtracted and even is added and the operator is 7,6,5,4,3,2 decreasing order