# A347949 (b-file synthesized from sequence entry) 0 1 1 0 2 1 3 2 4 6 5 64 6 170 7 2988 8 14616 9 180192 10 1934712 11 21673200 12 300266736 13 4220710272 14 61785461712 15 1003589762784 16 17448621367680 17 327598207658496 18 6279739240655232 19 134169095009652480 20 2817563310900129024 21 64570676279407718400 22 1547773850801172960000 23 38824156236466815920640