# A153468 (b-file synthesized from sequence entry) 1 1 2 12 3 324 4 19764 5 2727756 6 852196788 7 602756140068 8 965229960414132 9 3499562183624643780 10 28727144381588600187612 11 533909545388896809071238444 12 22466716989986988610061264294004 13 2140465899840618529308907998923768676