# A150032 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 16 4 64 5 216 6 856 7 2976 8 12832 9 48448 10 205888 11 782464 12 3480192 13 13840256 14 60745088 15 241676800 16 1093548544 17 4483687424 18 20050686976 19 82059288576 20 375415300096 21 1570813652992 22 7111318892544 23 29671917535232 24 136795784593408 25 580782992326656 26 2652281254117376 27 11224180146405376