# A152646 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 24 5 120 6 720 7 5040 8 40320 9 339840 10 3087648 11 30271392 12 324759072 13 3731733312 14 46734640160 15 618773953544 16 8801281435864