A015640 Number of 5-tuples of different integers from [ 1,n ] with no global factor.

0, 0, 0, 0, 1, 6, 21, 56, 126, 251, 461, 786, 1281, 1981, 2981, 4311, 6131, 8436, 11496, 15246, 20076, 25851, 33166, 41656, 52281, 64436, 79316, 96151, 116626, 139246, 166651, 196751, 232501, 271601, 317961, 367616, 426521, 489506