%I #9 Apr 30 2013 22:16:34

%S 16,320,8000,237440,8212736

%N Number of non-degenerate fanout-free Boolean functions of n variables having AND rank 4.

%D J. P. Hayes, Enumeration of fanout-free Boolean functions, J. ACM, 23 (1976), 700-709.

%H <a href="/index/Bo#Boolean">Index entries for sequences related to Boolean functions</a>

%F ~Hayes (1976, Theorem 3) gives a recurrence.

%Y A column of A225171.

%K nonn,more

%O 4,1

%A _N. J. A. Sloane_, Apr 30 2013