130560
domain: N
Appears in sequences
- Number of reversible strings with n beads of 4 colors. If more than 1 bead, not palindromic.at n=8A032087
- Number of primitive (aperiodic) palindromes using a maximum of two different symbols.at n=33A056458
- Number of primitive (aperiodic) palindromes using exactly two different symbols.at n=33A056463
- Number of polygons of length 2n with 3 (self-avoiding polygon) holes on square lattice (not allowing rotations).at n=2A056639
- Saint-Exupéry numbers: ordered products of the three sides of Pythagorean triangles.at n=34A057096
- a(n) = 2^(n+2)*(2^(n+1)-1).at n=7A059153
- Number of maximal chains in the Bruhat order of S_n.at n=4A061710
- Triangle of coefficients of polynomials (rising powers) useful for convolutions of A001333(n+1), n >= 0 (associated Pell numbers).at n=19A062134
- Smallest k such that d(phi(k)) - phi(d(k)) = -n, where d(k) = A000005(k) and phi(k) = A000010(k).at n=15A078151
- Number of n X n orthogonal matrices over GF(2) modulo permutations of rows.at n=8A088437
- a(n) = S1(n,2), where S1(n, t) = Sum_{k=0..n} (k^t * Sum_{j=0..k} binomial(n,j)).at n=9A089659
- Initial values for f(x)=phi(sigma(x)) such that iteration of f ends in cycle of length=11.at n=27A096888
- a(n) = Sum_{k=0..n} 2^max(k, n-k).at n=15A107659
- Weight distribution of [256,55,64] extended binary primitive BCH (or XBCH) code.at n=35A151623
- a(n) is the number of induced subgraphs with odd number of edges in the cycle graph C(n).at n=16A156232
- Table read by rows: The coefficients of the polynomials P(n, x) = Sum_{k=0..n} Sum_{j=0..k} (-1)^j * 2^(-k) * binomial(k, j) * (k-2*j)^n * x^(n-k).at n=61A193474
- Triangle T(n,k) gives the number of ordered partitions of an n set into k odd-sized blocks.at n=48A196776
- G.f.: (32*x^7/(1-2*x) + 16*x^5 + 24*x^6)/(1-2*x^2).at n=18A204696
- Number of bitstrings of length n (with at least two runs) where the last two runs have different lengths.at n=16A208901
- Numbers k such that k^2 XOR (k+1)^2 is a square, and k^2 XOR (k-1)^2 is a square, where XOR is the bitwise logical XOR operator.at n=9A224242