1419925

Appears in sequences

• Number of isotropic subspaces of a 2n-dimensional unitary space over GF(4).at n=3A018925
• a(n) = Sum_{d|5} phi(d)*n^(5/d).at n=17A054604
• a(n) = (2*n + 1)*((2*n + 1)^4 + 4).at n=8A069071
• Nonnegative walks of length n on the x-axis starting at the origin using steps {1,-1} and visiting no point more than twice.at n=43A212584
• a(n) = Product_{k=1..n-1} (4^k + 1).at n=5A309327