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A195460
a(n) = 2^(2*n+1) - 3*2^n - 1.
2
1, 19, 103, 463, 1951, 7999, 32383, 130303, 522751, 2094079, 8382463, 33542143, 134193151, 536821759, 2147385343, 8589737983, 34359345151, 137438167039, 549754241023, 2199020109823, 8796086730751, 35184359505919, 140737463189503
OFFSET
1,2
COMMENTS
Binary numbers of the form (n)00(m) where n and m are the number of 1's, m is the index and n=m-1.
FORMULA
a(n) = 2*a(n-1)+A052539(n) = a(n-1)+A103897(n) for n>1.
G.f.: x*(1+12*x-16*x^2)/((1-x)*(1-2*x)*(1-4*x)). - Bruno Berselli, Sep 19 2011
EXAMPLE
First few terms in binary are 1, 10011, 1100111, 111001111, 11110011111, 1111100111111.
PROG
(PARI) a(n)=1<<(2*n+1)-3<<n-1 \\ Charles R Greathouse IV, Sep 19 2011
(Magma) [2*4^n-3*2^n-1: n in [1..23]]; // Bruno Berselli, Sep 19 2011
CROSSREFS
Cf. A052539, A103897, A195461 (prime values).
Sequence in context: A101010 A356126 A201854 * A195461 A096328 A184190
KEYWORD
nonn,easy
AUTHOR
Brad Clardy, Sep 18 2011
STATUS
approved