eiy =	∞ n=0	(iy) n n!	=	1+logx/x[n]y +	(iy)² 2!	+	(iy)³ 3!	+	(iy)4 4!	+	(iy)5 5!	+	(iy)6 6!	+	(iy)7 6!	+	(iy)8 6!	+...