# A152345 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 24 5 120 6 608 7 3684 8 26640 9 192228 10 1659048 11 14739946 12 146975590 13 1544407392 14 17545685816 15 223201723716 16 2939542170692