19898

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 35.at n=33A020374
• Triangle T(n,k) of numbers of proper k-covers of an unlabeled n-set, k=1..2^n-2.at n=44A055127
• Numbers k such that 4^k + 3 is prime.at n=28A089437
• a(n) = 2^(n-1) - binomial(n, floor(n/2)).at n=15A093387
• Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n having k DUUU's starting at level 1.at n=24A135331
• Triangle T(n,k) read by rows: T(n, k) = (4*n-4*k+1)*T(n-1, k-1) + (4*k-3)*T(n-1, k) + 4*T(n-2, k-1) with T(n, 1) = T(n, n) = 1.at n=17A144441
• Triangle T(n,k) read by rows: T(n, k) = (4*n-4*k+1)*T(n-1, k-1) + (4*k-3)*T(n-1, k) + 4*T(n-2, k-1) with T(n, 1) = T(n, n) = 1.at n=18A144441
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 182", based on the 5-celled von Neumann neighborhood.at n=36A270632
• Sum of the next n positive integers repeated (A008619).at n=42A319006