194996

Appears in sequences

• Denominators of continued fraction convergents to sqrt(840).at n=7A042623
• Chebyshev polynomial of the second kind U(3,n).at n=29A144138
• a(n) = a(n-2)*2 + floor(sqrt(a(n-1))).at n=33A182559
• Equals two maps: number of nX2 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and vertical neighbors in a random 0..1 nX2 array.at n=9A220238