60186domain: NAppears in sequencesa(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=14A090296Number of base 12 n-digit numbers with adjacent digits differing by one or less.at n=9A126366a(n) = 36*n^2 - 8*n - 2 (n >=1).at n=40A304834