# A145618 (b-file synthesized from sequence entry) 1 2 2 12 3 12 4 168 5 504 6 5544 7 72072 8 144144 9 2450448 10 46558512 11 4232592 12 97349616 13 97349616 14 41721264 15 1209916656 16 75014832672 17 825163159392 18 5776142115744 19 213717258282528 20 213717258282528 21 1251772512797664 22 53826218050299552