Coefficient of x^n in A(x)^n is A000670(n), which gives preferential arrangements of n labeled elements.

A088791

Coefficient of x^n in A(x)^n is A000670(n), which gives preferential arrangements of n labeled elements.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =8a(5) =46a(6) =337a(7) =2976a(8) =30627a(9) =359222a(10) =4725968a(11) =68903766a(12) =1102712316a(13) =19219507328a(14) =362428546833

External references