67108864
domain: N
Appears in sequences
- a(n) is the number of distinct (infinite) output sequences from binary n-stage shift register which feeds back the complement of the last stage.at n=32A000016
- Number of primitive polynomials of degree n over GF(2) (version 2).at n=31A000020
- Number of n-bead necklaces with beads of 2 colors and primitive period n, when turning over is not allowed but the two colors can be interchanged.at n=32A000048
- Powers of 4: a(n) = 4^n.at n=13A000302
- a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3), n > 3, with a(0)=a(1)=a(2)=0, a(3)=1.at n=28A000749
- Successive numerators of Wallis's approximation to Pi/2 (reduced).at n=15A001901
- Numerator of n!!/(n+1)!! (cf. A006882).at n=30A004730
- a(0) = 1; thereafter a(n) = denominator of (n-2)!! / (n-1)!!.at n=31A004731
- Numerator of n!!/(n+3)!!.at n=30A004732
- Denominator of n!!/(n+3)!!.at n=27A004733
- a(n) = floor(2^(n-1)/n).at n=31A006788
- Dual pairs of integrals arising from reflection coefficients.at n=27A007179
- If n mod 4 = 0 then 2^(n-1)+1 elif n mod 4 = 2 then 2^(n-1)-1 else 2^(n-1).at n=26A007679
- a(n) = a(n-1)*a(n-2) with a(0)=1, a(1)=4.at n=7A010099
- 13th powers: a(n) = n^13.at n=4A010801
- Number of primitive polynomials of degree n over GF(2).at n=31A011260
- Coefficients of expansion of (1-x)/(1-2*x) in powers of x.at n=27A011782
- a(n) = 4^(2*n+1).at n=6A013709
- a(n) = 2^(3*n+2).at n=8A013731
- a(n) = 4^(3*n+1).at n=4A013734