OFFSET
2,1
REFERENCES
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
P. E. Wood, Jr., Switching Theory, McGraw-Hill, 1968, see p. 263.
LINKS
Michael De Vlieger, Table of n, a(n) for n = 2..410
FORMULA
a(n) = (2^s)!/((2^s-n)!*s!) where s = ceiling(log_2 n).
MATHEMATICA
Array[(2^#2)!/((2^#2 - #1)!*#2!) & @@ {#, Ceiling@ Log2@ #} &, 19, 2] (* Michael De Vlieger, Nov 05 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms and formula corrected by Sean A. Irvine, Sep 24 2017
STATUS
approved