A060178 Sum of orders of all odd permutations of n letters.
0, 2, 6, 36, 260, 1860, 18732, 162176, 1774656, 20909160, 320781560, 4493532912, 72263548656, 1081552065776, 16682494491600, 315573151180800, 7042434106860032, 151228601744085216, 3306518316205792416
Offset: 1