31460

Appears in sequences

• Numbers k such that sopfr(k) = sopfr(k - sopfr(k)).at n=30A050781
• a(n) = (5*n + 9)*binomial(n+8, 8)/9.at n=7A055844
• Eighth column of (1,5)-Pascal triangle A096940.at n=9A096945
• Number of returns to the x-axis from above (i.e., d steps hitting the x-axis) in all Grand Motzkin paths of length n.at n=9A109196
• Expansion of x^2*(2+x)/(1-3*x-4*x^2-x^3).at n=8A120757
• Row sums of A118354.at n=7A151616
• a(n) = 65*n^2.at n=21A165798
• Numbers k for which there are no prime numbers in the range (k-4*sqrt(sqrt(k)), k].at n=24A192320
• Triangle read by rows, Lah numbers of order 2, T(n,n) = 1, T(n,k) = 0 if k<0 or k>n, otherwise T(n,k) = T(n-1,k-1)+((n-1)^2+k^2)*T(n-1,k), for n>=0 and 0<=k<=n.at n=24A268434
• G.f. A(x) satisfies A(x) = 1 + x + x^4*A(x)^2.at n=32A366554
• Number of n-element sets of singletons or pairs of distinct elements of {1..n}, or loop graphs with n edges, such that it is not possible to choose a different element from each.at n=6A368596