# A109774 (b-file synthesized from sequence entry) 1 0 2 8 3 104 4 1040 5 9680 6 88088 7 795704 8 7170080 9 64556960 10 581091368 11 5230058504 12 47071235120 13 423643241840 14 3812795553848 15 34315179116504 16 308836669444160 17 2779530197184320 18 25015772291219528 19 225141952170657704 20 2026277574184965200 21 18236498181611824400