258720

Appears in sequences

• Triangle T(n,k) (n >= 2, 2 <= k <= n-1 if n > 2) giving number of non-crossing trees with n nodes and k endpoints.at n=39A072247
• Triangle read by rows: T(n,k) is the number of n-bead necklaces with exactly k different colored beads.at n=42A087854
• Triangle T(n,k) of number of labeled directed multigraphs (with loops), without isolated vertices, with n arrows and k vertices (n = 1,2,.., k = 1..2*n).at n=26A120945
• Triangle T, read by rows, where T(n,k) = A008544(n-k)*C(n,k) where A008544 equals the triple factorials in column 0.at n=30A136216
• Record gaps between nonprime prime powers.at n=37A167186
• Number of non-monotonic functions from [k] to [n-k].at n=48A189711
• Number of nX3 0..3 arrays with no element equal to the sum modulo 4 of elements to its left or elements above it.at n=4A238770
• Number of nX5 0..3 arrays with no element equal to the sum modulo 4 of elements to its left or elements above it.at n=2A238772
• T(n,k)=Number of nXk 0..3 arrays with no element equal to the sum modulo 4 of elements to its left or elements above it.at n=23A238775
• T(n,k)=Number of nXk 0..3 arrays with no element equal to the sum modulo 4 of elements to its left or elements above it.at n=25A238775
• Numerator of the harmonic mean of the first n composite numbers.at n=13A250132
• Number T(n,k) of primitive (= aperiodic) n-bead necklaces with colored beads of exactly k different colors; triangle T(n,k), n >= 0, 0 <= k <= n, read by rows.at n=52A254040
• Number of primitive (=aperiodic) n-bead necklaces with colored beads of exactly 7 different colors.at n=2A254079
• Triangle of coefficients T(n,k) of y^k in Product_{k=0..n-1} (1 + (k+2)*y + y^2), read by rows of terms k = 0..2*n, for n >= 0.at n=69A324960
• Triangle of coefficients T(n,k) of y^k in Product_{k=0..n-1} (1 + (k+2)*y + y^2), read by rows of terms k = 0..2*n, for n >= 0.at n=75A324960
• Expansion of e.g.f. 1/(1 - (exp(x^2) - 1)/x).at n=8A375795