# A012836 (b-file synthesized from sequence entry) 0 1 1 0 2 20 3 -280 4 18000 5 -1277760 6 159922880 7 -26119949440 8 5923118588160 9 -1705199348152320 10 619341836139299840 11 -274598298613483878400 12 146431095418622106193920 13 -92305017354779154307399680