The Fibonacci sequence (1, 1, 2, 3, 5, 8, 13, 21, 34...) can be called the 2bonacci sequence. The 3bonacci sequence is 1, 1, 1, 3, 5, 9, 17, 31, 57, 105, 193, 355, 653, 1201...and the 4bonacci sequence is 1, 1, 1, 1, 4, 7, 13, 25, 49, 94, 181, 349, 673... Complete the n_bonacci function that returns the n_bonacci number in position p of the sequence. The first number of the sequence is in position 0.