327184

Appears in sequences

• Number of words of length n over an alphabet of size 4 that are not "bifix-free".at n=10A094559
• A094559/4.at n=11A094578
• a(n) = ((n-1)^2*n^2*(n+1)^2)/6 - 2*Sum_{l=2..n}Sum_{k=2..n}(n-k+1)*(n-l+1)*(k-1)*(l-1).at n=12A169801
• Expansion of 3F2( 2, 1/2, 3/2; 3, 4;16 x).at n=7A186262
• Non-Niven (or non-Harshad) numbers that are divisible by the square of the sum of the squares of their digits.at n=10A379981
• Nonmultiples of 10 that are divisible by the square of the sum of the squares of their digits.at n=25A379982