440750

Appears in sequences

• Number of n-step walks on square lattice.at n=12A002900
• a(n) = (1/24)*(n+1)*(n+6)*(n^3+26*n^2+225*n+636).at n=20A090948
• Number of 0..2 arrays of length n with each element differing from at least one neighbor by something other than 1, starting with 0.at n=15A221536
• Even numbers k such that the sum of divisors of k in Gaussian integers is a real number.at n=16A332532
• a(n) = Sum_{k=0..floor(n/3)} (k+1) * binomial(2*k,2*n-6*k).at n=31A382496