80750

Appears in sequences

• a(n) = number of (s(0), s(1), ..., s(2*n-1)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| = 1 for i = 1,2,...,n, s(0) = 3, s(2*n-1) = 4. Also a(n) = T(2*n-1,n-1), where T is defined in A026022.at n=9A026026
• T(n,[ n/2 ]), where T is defined in A026022.at n=19A026034
• a(n) = Sum_{d|n} sigma(n/d)*d^3.at n=35A027847
• a(n) = 10*a(n-1) - 5*a(n-2), with a(0)=0, a(1)=1.at n=6A190987
• Number of -2..2 arrays x(0..n+2) of n+3 elements with zero sum and no two or three adjacent elements summing to zero.at n=7A200424
• Square array T(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of g.f. 1/(1 - 2*k*x + k*x^2).at n=60A342133