30,10,15,13, 0, 16, -15, -621 -20, 5, -2, -13, 16, -31, -606 25, -7, -11, 29, -47, -575 -32, -4, 40, -76, -528 28, 44, -116, -452 16, -160, -336 -176, -176
What number comes next in this sequence: 1 4 8 13 21 30 36 ??