What's the next number in this sequence?

[melissa]

3, 12, 33,...

[P.A.R.]

87?3,12,3312-3=933-12=2121-9=1233+21=5433+54=87

[Meili]

the next number is 72let x= the position of the number relative to the sequencethe number is determined by x^3 + 2x1^3 +2(1)= 32^3 + 2(2)=123^3 +2(3)= 334^3 +2(4)=72

[wowzers]

I would say 46. 3+ 9 = 1212+11 = 3333+13 = 46