95760

Appears in sequences

• Number of n-step mappings with 4 inputs.at n=32A005945
• Numbers k such that sigma(k) >= 4*k.at n=11A023198
• Base 9 digital convolution sequence.at n=11A033646
• Expansion of e.g.f. (1-x)/(1-x-2*x^2+x^3).at n=7A052672
• Take n points in general position in the plane; draw all the (infinite) straight lines joining them; sequence gives number of connected regions formed.at n=31A055503
• Number of reversible strings with n beads using exactly six different colors.at n=7A056313
• Number of primitive (aperiodic) reversible strings with n beads using exactly six different colors.at n=7A056322
• Numbers k such that sigma(k) > 4*k.at n=9A068404
• Compute S, the number of different quadratic residues modulo B for every base B. If the density S/B is smaller for B than for every B' less than B, then B is added to the sequence.at n=43A085635
• Numbers that can be expressed as the difference of the squares of primes in exactly seven distinct ways.at n=28A092003
• n*(n-1)*(n^2-n+4)/6.at n=28A103290
• Triangle read by rows: T(n,k) is number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1),U=(1,2), or d=(1,-1) and have k peaks (i.e., ud and Ud's).at n=24A108425
• a(n) is the denominator of the sum of the reciprocals of the positive integers k, k<=n, where every positive integer <= k and coprime to k is also coprime to n.at n=37A126262
• Highly abundant numbers (A002093) that are not Harshad numbers (A005349).at n=5A128702
• a(n) = denominator of Sum_{k=1..n} k^mu(n+1-k), where mu(m) = A008683(m).at n=19A130492
• If X_1,...,X_n is a partition of a 2n-set X into 2-blocks then a(n) is equal to the number of 4-subsets of X containing none of X_i, (i=1,...,n).at n=17A130810
• a(n) = the least integer > n such that r(1)|a(n), r(2)|(a(n)+1), r(3)|(a(n)+2),... and r(n)|(a(n)+n-1), where (r(1),r(2),r(3),...,r(n)) is some permutation of (1,2,3,...,n).at n=21A138588
• Determinant of power series with alternate signs of gamma matrix with determinant 6!.at n=1A158049
• a(n) = (8^n/n!^2) * Product_{k=0..n-1} (16k+3)*(16k+5).at n=2A184887
• Numbers with prime factorization pqrs^2t^4.at n=4A190384