20790

Appears in sequences

• Number of partitions into non-integral powers.at n=18A000160
• a(n) = (3^n/n!) * Product_{k=0..n-1} (3*k + 5).at n=4A004992
• Number of n-step walks on square lattice in the first quadrant which finish at distance n-3 from the x-axis.at n=32A005564
• a(n) = 5*(n+1)*binomial(n+3,6).at n=5A027791
• a(n) = 7*(n+1)*binomial(n+3,7).at n=4A027792
• Number of partitions satisfying cn(2,5) <= cn(0,5) + cn(1,5) + cn(4,5) and cn(3,5) <= cn(0,5) + cn(1,5) + cn(4,5).at n=37A039871
• Triangular table of 2^n *(n+k)! / ((n-k)! * k! * 4^k).at n=26A043302
• Number of level permutations of degree n.at n=8A053195
• Smallest x such that sigma(x) = n*phi(x), or -1 if no such x exists.at n=15A055234
• Triangle T(n,k) of number of minimal 2-covers of a labeled n-set that cover k points of that set uniquely (k=2,..,n).at n=50A057963
• a(n) is both the sum of n+1 consecutive integers and the sum of the n immediately higher consecutive integers.at n=27A059270
• a(1)=1, a(2)=2; thereafter, a(n) is the smallest number m not yet in the sequence such that every prime that divides a(n-1) also divides m.at n=31A060735
• Triangle of coefficients of Bessel polynomials {y_n(x)}'.at n=30A065931
• Triangle of coefficients of Bessel polynomials {y_n(x)}''.at n=23A065943
• Triangular table of coefficients of the Hermite polynomials, divided by 2^floor(n/2).at n=67A067613
• Denominator of Borwein integral of order 2n+1, as defined by Weisstein.at n=5A068215
• Irregular array, read by rows: T(n,k) is the number of labeled acyclic digraphs with n nodes and k arcs (n >= 0, 0 <= k <= n*(n-1)/2).at n=30A081064
• a(n) = Min {x : sigma(x) = phi(n*x), x is not a prime}, least nonprime solutions to sigma(x) = phi(n*x).at n=16A087979
• a(n) = Min {x : sigma(x) = phi(n*x), x is not a prime}, least nonprime solutions to sigma(x) = phi(n*x).at n=15A087979
• a(n) = Min{x : sigma(x) = n*phi(x), x is not a prime}, the least nonprime solutions to sigma(x) = n*phi(x); special balanced numbers.at n=15A088830