26165

Appears in sequences

• Numbers k such that 219*2^k+1 is prime.at n=39A032486
• Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 19.at n=14A051984
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 443", based on the 5-celled von Neumann neighborhood.at n=31A272227
• Number of partitions of 2n whose Ferrers-Young diagram cannot be tiled with dominoes.at n=22A304710
• Irregular triangle: T(n,k) is the number of permutations in S_n that have exactly k occurrences of the pattern 4213. 0 <= k <= A342646(n).at n=57A342840
• a(n) is the number of free polyominoes of width 4 and size n.at n=8A354850