1 4 15 56 what's the next number?

The rule of this problem is that the sum of the previous number and the next number is four times the number in the middle, that is, an = (an-1 + an + 1) / 4 1 = (0 + 4) / 4 4 4 = (1 + 15) / 4 15 = (4 + 56) / 4, so the next number is 56 times 4 minus 15, and the answer is 209 or 56 = (15 + x) / 4

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