23808

Appears in sequences

• Number of partitions into one kind of 1's, two kinds of 2's, and three kinds of 3's.at n=43A002597
• Theta series of {D_9}^{+} packing.at n=33A008436
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 77.at n=27A031575
• (1+e)-harmonic numbers: harmonic mean of (1+e)-divisors is an integer.at n=12A053783
• a(n) = 2^(4*n-1) - 2^(2*n-1)*binomial(2*n,n).at n=4A055787
• Triangle T(n,k) generalizing the tangent numbers.at n=11A064190
• a(n) = the maximum number of lattice points touched by an origin-centered 4d-sphere with radius <= n.at n=32A071345
• a(n) = the maximum number of lattice points touched by an origin-centered 4d-sphere with radius <= n.at n=33A071345
• Number of degree-n irreducible polynomials over GF(4) with trace 0 and subtrace 1.at n=10A074032
• Number of degree-n irreducible polynomials over GF(4) with trace 1 and subtrace 0.at n=10A074033
• Let a = RootOf( x^2+x+1 ) and b = 1+a. Number of degree-n irreducible polynomials over GF(4) with trace 1 and subtrace a.at n=10A074035
• Number of 4-ary Lyndon words of length n over GF(4) with trace 0 and subtrace 1.at n=10A074447
• Number of 4-ary Lyndon words of length n over GF(4) with trace 1 and subtrace 0.at n=10A074448
• Let x = RootOf(z^2 + z + 1) and y = 1+x. Number of 4-ary Lyndon words of length n over GF(4) with trace 1 and subtrace x.at n=10A074450
• Coefficients in expansion of Eisenstein series -q*E'_2.at n=30A076835
• Numbers k such that Omega(k) = Omega(k+1) + Omega(k+2) + Omega(k+3) + Omega(k+4) where Omega(k) denotes the number of prime factors of k, counting multiplicity.at n=21A078094
• A sequence generated from the Narayana triangle considered as a matrix, or from Pascal's triangle.at n=7A095266
• Expansion of ((1+x)/(1-2x))^2.at n=10A113070
• Number of real n X n symmetric (+1,-1) matrices with nonzero permanent.at n=4A118993
• Records in A000118.at n=37A128690