OFFSET
0,2
REFERENCES
J. P. Hayes, Enumeration of fanout-free Boolean functions, J. ACM, 23 (1976), 700-709.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
K. L. Kodandapani and S. C. Seth, On combinational networks with restricted fan-out, IEEE Trans. Computers, 27 (1978), 309-318. (Annotated scanned copy)
FORMULA
a(n) = Sum_{k=0..n-1} binomial(n, k) * s(k) where s(0)=2 and s(n) = A005640(n + 1) otherwise. - Sean A. Irvine, Jul 21 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Sean A. Irvine, Jul 21 2016
STATUS
approved