Conflicts during insertions into exchange trees on n nodes.

A007905

Conflicts during insertions into exchange trees on n nodes.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =4a(4) =30a(5) =216a(6) =1440a(7) =11040a(8) =112560a(9) =1229760a(10) =14333760a(11) =179988480a(12) =2259290880a(13) =30656102400a(14) =446269824000

External references