18036

Appears in sequences

• Expansion of Product_{m>=1} (1-m*q^m)^27.at n=5A022687
• Table by antidiagonals of T(n,k) = 2*n*T(n,k-1) - n^2*T(n,k-2) + T(n,k-4) starting with T(n,1) = 1.at n=47A073135
• Number of base 16 circular n-digit numbers with adjacent digits differing by 3 or less.at n=5A125326
• a(n) = n*(14*n-3).at n=36A185019
• Numbers whose arithmetic derivatives are a permutation of their digits.at n=29A225902
• Expansion of Sum_{i>=1} mu(i)^2*x^i/(1 - x^i) * Product_{j=1..i} 1/(1 - mu(j)^2*x^j), where mu() is the Moebius function (A008683).at n=42A284835
• Expansion of Sum_{k>=1} phi(k) * x^k/(1 - x^k)^4, where phi = Euler totient function (A000010).at n=43A309323