93486

Appears in sequences

• a(n) = K_4(n) = Sum_{k>=0} A090285(4,k)*2^k*binomial(n,k). a(n) = 2*(n^4+14*n^3+62*n^2+91*n+21)/3.at n=16A090296
• a(n) is the number of free polyominoids that have faces aligned to precisely 2 planes.at n=7A385399