134209536

Appears in sequences

• a(n) = 2^(n-1)*(2^n - (-1)^n).at n=14A003674
• a(n) = 2^(n-1)*(2^n - 1), n >= 0.at n=14A006516
• Dual pairs of integrals arising from reflection coefficients.at n=28A007179
• Number of Barlow packings with group P6(bar)m2 that repeat after 2n layers.at n=28A011949
• a(n) = 4^n*(4^n - 1)/2.at n=7A026337
• Number of reversible strings with n beads of 2 colors. If more than 1 bead, not palindromic.at n=27A032085
• Number of reversible strings with n beads of 4 colors. If more than 1 bead, not palindromic.at n=13A032087
• Sum of every 4th entry of row n in Pascal's triangle, starting at "n choose 0".at n=29A038503
• Sum of every 4th entry of row n in Pascal's triangle, starting at "n choose 1".at n=29A038504
• Number of elements of GF(2^n) with trace 0 and subtrace 0.at n=29A038518
• Number of elements of GF(2^n) with trace 1 and subtrace 0.at n=29A038520
• a(n) = A000225(n+3)-A052955(n).at n=24A086652
• a(n) = Sum_{k = 0..n} C(4*n + 1, 4*k).at n=7A090407
• 2^(n-1)J(n,1/2) where J(n,x)=n-th Jacobsthal polynomial.at n=27A109243
• Number of compositions of n with an even number of 1's.at n=29A113979
• G.f.: 1/((1-2*x)*(1-2*x^2)).at n=26A122746
• A006516 at positions with even indices, A007582 at positions with odd indices.at n=28A137173
• Numbers of the form 2^(n-1)*(2^n - 1) which aren't perfect numbers.at n=9A144858
• a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 15.at n=3A161025
• a(n) = 6*a(n-1) - 8*a(n-2) for n > 1, a(0)=1, a(1)=6.at n=13A171476