20572

Appears in sequences

• Coordination sequence for MgZn2, Position Zn1.at n=36A009937
• a(n) = prime(n)*prime(n+1) - prime(n).at n=33A037166
• Number of returns to the x-axis (i.e., d or u steps hitting the x-axis) in all Grand Motzkin paths of length n. (A Grand Motzkin path of length n is a path in the half-plane x>=0, starting at (0,0), ending at (n,0) and consisting of steps u=(1,1), d=(1,-1) and h=(1,0).).at n=8A109194
• Number of generalizations of the partition 1^n.at n=10A213242
• a(n) = n + floor( n^2/2 + n^3/3 ).at n=39A236773
• Number of isoscent sequences of length n with maximal number of ascents.at n=32A243237
• Number of length 3+4 0..n arrays with every five consecutive terms having four times some element equal to the sum of the remaining four.at n=8A249659
• Number of (4+1) X (n+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.at n=17A258557
• a(n) is the number of terms in the analog of A121805 but starting with n, or -1 if that sequence is infinite.at n=10A330128