# A120017 (b-file synthesized from sequence entry) 1 1 2 2 3 4 4 10 5 32 6 116 7 440 8 1708 9 6760 10 27232 11 111392 12 461536 13 1933024 14 8170400 15 34807232 16 149304080 17 644298592 18 2795216576 19 12184415360 20 53338632256 21 234393350912 22 1033614750080 23 4572427361536 24 20285780245120 25 90238113332992