# A109682 (b-file synthesized from sequence entry) 1 2 2 7 3 24 4 80 5 238 6 723 7 2183 8 5653 9 19674 10 59042 11 177145 12 531429 13 1594313 14 4782955 15 14348892 16 43046708 17 129140146 18 387420471 19 1162261451 20 3486784397 21 10460353182 22 31381059590 23 94143178804 24 282429536457 25 847288609421