Number of permutations of n objects such that no two-element subset is preserved.
A137482
Number of permutations of n objects such that no two-element subset is preserved.
Terms
- a(0) =1a(1) =1a(2) =0a(3) =2a(4) =14a(5) =54a(6) =304a(7) =2260a(8) =18108a(9) =161756a(10) =1618496a(11) =17815896a(12) =213767080a(13) =2778833992a(14) =38904145344a(15) =583563781424
External references
- oeis: A137482