19887

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 47.at n=38A031545
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 47.at n=2A031725
• T(n,k) is the number of labeled graphs of n vertices and k edges that have endpoints, where an endpoint is a vertex with degree 1.at n=30A245796
• Triangle read by rows: T(n,k) is the number of weighted lattice paths in B(n) having k ascents. The members of B(n) are paths of weight n that start at (0,0), end on but never go below the horizontal axis, and whose steps are of the following four kinds: an (1,0)-step with weight 1, an (1,0)-step with weight 2, a (1,1)-step with weight 2, and a (1,-1)-step with weight 1. The weight of a path is the sum of the weights of its steps. An ascent is a maximal sequence of consecutive (1,1)-steps.at n=46A246186
• Number of (n+1)X(7+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.at n=4A250728
• Number of (5+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.at n=6A250734
• 24-hedral numbers: a(n) = (2*n + 1)*(8*n^2 + 14*n + 7).at n=10A254473
• Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 4 or 7 king-move adjacent elements, with upper left element zero.at n=15A298496
• Partial sums of A033616.at n=34A299902
• a(n) = n! * Sum_{k=0..n} k^(k*n)/k!.at n=3A356689
• a(n) = K(n-1) + K(n) + K(n+1), where K(n) = A341711(floor(n/2)).at n=17A361151
• a(n) = index of 2*prime(n) in A381019.at n=33A379811