2 , 5 , 18 , 87 , _ , _ , ............................
Answer
2 , 5 , 18 , 87 , _ , _ , ............................
Tn = [Tn-1 * (n+1)] - (n-1)
T2 = [T1 * (2+1)] - (2-1) = 2 * 3 -1 = 5
T3 = [T2 * (3+1)] - (3-1) = 5 * 4 -2 = 18
T4 = [T3 * (4+1)] - (4-1) = 18 * 5 -3 = 87
T5 = [T4 * (5+1)] - (5-1) = 87 * 6 -4 = 518
T6 = [T3 * (6+1)] - (6-1) = 518 * 7 -5 = 3621
2 , 5 , 18 , 87 , 518 , 3621 , ............................
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