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A015635
Number of ordered quadruples of integers from [ 1,n ] with no common factors between triples.
0
1, 3, 9, 18, 43, 62, 125, 181, 282, 370, 597, 725, 1090, 1336, 1709, 2085, 2873, 3280, 4366, 5018, 6054, 6966, 8854, 9790, 11943, 13451, 15744, 17530, 21237, 22839, 27331, 30169, 34186, 37498, 42916, 45948, 53484, 58104, 64699, 69534, 79743
OFFSET
1,2
CROSSREFS
Sequence in context: A291143 A057578 A271370 * A062882 A363534 A027101
KEYWORD
nonn
STATUS
approved