OFFSET
1,2
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = 4 * A007088(n-1).
MATHEMATICA
FromDigits/@Tuples[{0, 4}, 6] (* Harvey P. Dale, Dec 21 2018 *)
PROG
(PARI) print1(0); for(d=1, 5, for(n=2^(d-1), 2^d-1, print1(", "); forstep(i=d-1, 0, -1, print1((n>>i)%2*4)))) \\ Charles R Greathouse IV, Nov 16 2011
(Haskell)
a169967 n = a169967_list !! (n-1)
a169967_list = map (* 4) a007088_list
-- Reinhard Zumkeller, Jan 10 2012
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
N. J. A. Sloane, Aug 07 2010
STATUS
approved