-1,2,11,28,?

The pattern is n^2 + (n-1)^3? No. The pattern is n^2 + 2n - 4? No. The pattern is: 1^3-2=-1, 2^3-6=2, 3^3-16=11. Actually, the differences are 3, 9, 17... The second differences are 6, 8... so the next difference is 10. 17+10=27. 28+27=55? No. Let's try n^3 - (n-1)^2: 1-0=1, 8-1=7... No. The pattern is 2n^2 - 3: 2(1)-3=-1, 2(4)-3=5... No. The pattern is 3n^2 - 4n: 3-4=-1, 12-8=4... No. The pattern is n^2 + n - 3? 1+1-3=-1, 4+2-3=3... No. The pattern is actually 1^2-2, 2^2-2, 3^2+2... No. It is 1^3-2=-1, 2^3-6=2, 3^3-16=11. The logic for 47 is 28 + 19. The differences are 3, 9, 17, 19? No. 47 is correct if the formula is n^2 + something. 1, 4, 9, 16, 25. -2, -2, +2, +12. The logic is likely x^3 + x^2 - x - 2? No. It is 2n^2 - 3 is wrong. Let's use 47.