18556

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 80 ones.at n=14A031848
• Matrix inverse of triangle A055898.at n=47A055905
• Numbers k such that numerator(Bernoulli(2*k)/(2*k)) is different from numerator(Bernoulli(2*k)/(2*k*(2*k-1))).at n=72A090495
• Total number of parts in the tails below the Durfee squares of all partitions of n.at n=26A114089
• Numbers of ways in which a unit disc can be dissected into 6n curvilinear triangles, at least one of which does not contain the center.at n=28A193362
• Number of -2..2 arrays x(i) of n+1 elements i=1..n+1 with set{t,u,v in 0,1}((x[i+t]+x[j+u]+x[k+v])*(-1)^(t+u+v)) having four or six distinct values for every i,j,k<=n.at n=8A211573
• Number of tilings of a 3 X 3 X n box using 3n bricks of shape 3 X 1 X 1.at n=8A233289
• Number A(n,k) of tilings of a k X k X n box using k*n bricks of shape k X 1 X 1; square array A(n,k), n>=0, k>=1, read by antidiagonals.at n=63A233308
• Number of n X n 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three no more than once.at n=2A269136
• Number of nX3 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three no more than once.at n=2A269138
• T(n,k)=Number of nXk 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three no more than once.at n=12A269143
• Number of nX4 0..1 arrays with exactly n+4-2 having value 1 and no three 1s forming an isosceles right triangle.at n=8A272954
• a(n) = n*x^n + (n-1)*x^(n-1) + . . . + x + 1 for x=5.at n=5A277975
• G.f.: Sum_{k>=0} x^(k*(k+1)) / Product_{j=1..k} (1 - x^(2*j-1))^2.at n=50A376622
• Number of fundamentally different graceful labelings of the n-antiprism graph.at n=4A387791