4, 13, 28, 52, 91, 154, 256, 421, 688, 1120, 1819, 2950, 4780, 7741, 12532, 20284, 32827, 53122, 85960, 139093, 225064, 364168, 589243, 953422, 1542676, 2496109, 4038796, 6534916, 10573723, 17108650, 27682384, 44791045, 72473440, 117264496, 189737947