# A009163 (b-file synthesized from sequence entry) 0 1 1 0 2 0 3 0 4 12 5 -60 6 570 7 -3780 8 36960 9 -326592 10 3712200 11 -41836080 12 554861736 13 -7563345504 14 114963916704 15 -1819859452320 16 31173297642240 17 -558346710891904 18 10642982507666880 19 -212150797420894848 20 4456607540110934912