2096128

Appears in sequences

• a(n) = 2^(n-1)*( 2^n + (-1)^n ).at n=11A003665
• a(n) = 2^(n-1)*(2^n - 1), n >= 0.at n=11A006516
• Dual pairs of integrals arising from reflection coefficients.at n=22A007179
• Number of Barlow packings with group P6(bar)m2 that repeat after 2n layers.at n=22A011949
• Number of reversible strings with n beads of 2 colors. If more than 1 bead, not palindromic.at n=21A032085
• Sum of every 4th entry of row n in Pascal's triangle, starting at "n choose 1".at n=23A038504
• Sum of every 4th entry of row n in Pascal's triangle, starting at binomial(n,2).at n=23A038505
• Number of elements of GF(2^n) with trace 0 and subtrace 1.at n=23A038519
• Number of elements of GF(2^n) with trace 1 and subtrace 0.at n=23A038520
• a(n) = 2^(p-1)*(2^p-1) where p is prime(n).at n=4A060286
• Infinite lower triangular matrix, M, that satisfies [M^4](i,j) = M(i+1,j+1) for all i,j>=0 where [M^n](i,j) denotes the element at row i, column j, of the n-th power of matrix M, with M(0,k)=1 and M(k,k)=1 for all k>=0.at n=33A078536
• a(n) = 2^(4n+1) - 2^(2n).at n=5A079598
• Smallest triangular number having n^2 as divisor.at n=31A080983
• Smallest triangular number with exactly n divisors, or 0 if no such number exists.at n=43A081978
• a(n) = A000225(n+3)-A052955(n).at n=18A086652
• 2^(n-1)J(n,1/2) where J(n,x)=n-th Jacobsthal polynomial.at n=21A109243
• Number of compositions of n with an even number of 1's.at n=23A113979
• G.f.: 1/((1-2*x)*(1-2*x^2)).at n=20A122746
• A006516 at positions with even indices, A007582 at positions with odd indices.at n=22A137173
• Interleave A038504 with A131577.at n=46A137776