38484

Appears in sequences

• Number of homeomorphically irreducible multigraphs (or series-reduced multigraphs or multigraphs without nodes of degree 2) on 4 labeled nodes.at n=19A060534
• Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 7 (most significant digit on right).at n=14A061936
• Illustration of Viswanath's constant A078416.at n=12A083404
• a(1) = a(2) = 1; for n>2, a(n+1) = a(n) + a(n-1) iff n is prime, otherwise a(n+1) = a(n) + 1.at n=48A113050
• Triangle read by rows: row n gives coefficients of expansion of polynomial p(k,n) in powers of k, defined by p(k, 0) = 1, p(k, 1) = 1+2*k; for n>1, p(k,n) = If[Mod[n, 2] == 0, (1 + 2*k)*p(k, n - 1) + n*Binomial[n + 1, n - 1]*k*(k + 1)*p(k, n - 2), (1 + 2*k)*(1 + 3*(p(k, n - 1) - 1))].at n=30A167883
• Sum of the squarefree parts of the partitions of n into 6 parts.at n=38A309481
• Triangle read by rows: T(n,k) is the number of n-bead bracelets using exactly k colors with no adjacent beads having the same color.at n=49A330341